Which is denser, one cup of water or 6 cups of water?

Answer:

it can be used to date the sedimentary rock where the fossils of ancient humans or their hominid ancestors are found.

Explanation:

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The reaction rate will decrease in the second experiment when the concentration of both compounds is lowered. This is because the rate of a chemical reaction is directly proportional to the concentration of the reactants.

The rate of a chemical reaction is directly proportional to the concentration of the reactants.

This is because increasing the concentration of the reactants increases the number of reactant molecules available to collide with each other, which results in a faster reaction rate.

Other factors that can affect the rate of a chemical reaction include temperature, pressure, the presence of a catalyst, and the surface area of solid reactants. Increasing temperature, pressure, or the surface area of solid reactants generally leads to a faster reaction rate, while the presence of a catalyst can increase the rate of a reaction without being consumed in the process.

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pH is 5.41 at equivalence point of equivalence point.

Potassium hydrogen phthalate (KHC₈H₄O₄) is a weak acid that has a dissociation constant (Ka) of 3.91 x 10^-6.

To determine the pH at the half-equivalence point of potassium hydrogen phthalate we need to know what is equivalence point is-

The half-equivalence point (pH = pKa) refers to the stage at which half the acid has been converted to the conjugate base, and the pH equals the pKa of the acid. At the half-equivalence point, the number of moles of acid that has been consumed is equal to the number of moles of base that has been consumed.

The formula for the calculation of pH at the half-equivalence point is given below:

pH = pKa + log (cB / cA)

Where,cB is the concentration of the conjugate base, and cA is the concentration of the weak acid.

Since the volume of the titrant is the same at the half-equivalence point, the concentration of the conjugate base and the weak acid will be the same.

So, pH = pKa = -log (3.91 x 10^-6) = 5.41

Therefore, the pH of potassium hydrogen phthalate (KHC₈H₄O₄) at the half-equivalence point is 5.41.

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When 1-propanol is used as the solvent instead of 2-methyl-2-butanol, the ratio of the products and the precise yields may vary.

The reaction of KOH with 1-propanol typically results in the formation of two alkenes: propene and 2-propen-1-ol. The ratio of these two products will depend on the reaction conditions, such as temperature, concentration of KOH, and reaction time.

The specific yields of the two alkenes will depend on the efficiency of the reaction, as well as the selectivity of the reaction towards each product. In general, propene is expected to be the major product due to its thermodynamic stability. However, if the reaction conditions favor the formation of 2-propen-1-ol, then the specific yield of this product may be higher.

If the solvent is substituted for 2-methyl-2-butanol, the reaction conditions may be affected due to the differences in physical and chemical properties of the solvent. For example, 2-methyl-2-butanol has a higher boiling point and lower polarity than 1-propanol, which may result in different reaction rates and selectivities. The reaction may also be affected by the steric hindrance of the solvent, which can affect the accessibility of the KOH to the reactant.

Therefore, the ratio of products and specific yields may be different when using 2-methyl-2-butanol as the solvent compared to 1-propanol.

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Silver phosphate is created as a precipitate sodium nitrate is formed as a precipitate there is no reaction silver is oxidised silver is reduced.

The ions of both compounds interchange when silver nitrate (AgNO3) and sodium chloride (NaCl) solution are combined. As a result, white precipitates of silver chloride (AgCl) and sodium nitrate solution (NaNO3) are produced.

Silver phosphate and sodium nitrate are produced as a result of the interaction between silver nitrate and sodium phosphate. Due to its insoluble in water nature, silver phosphate precipitates out of the solution.

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On the sawdust, the oxygen pressure is higher. Due to this, pieces of wood burn more quickly than logs of the same mass. A. A log of wood has a larger surface area and requires longer time to burn.

The surface area of the substance affects how quickly combustion reactions take place. The rate of the combustion reaction increases with surface area. This is due to the large surface area material's frequent exposure to oxygen.

The more oxygen molecules that collide per second with the fuel, the faster the combustion reaction is.

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The specific rotation of (S)-2-methoxypentane is +29.6.

To determine the specific rotation of (S)-2-methoxypentane, given that the specific rotation of (R)-2-methoxypentane is -29.6, follow these steps:

1. Identify the enantiomers: (R)-2-methoxypentane and (S)-2-methoxypentane are enantiomers, which are non-superimposable mirror images of each other.

2. Understand specific rotation: Specific rotation is a property of chiral molecules, and the specific rotation of one enantiomer has the same magnitude but opposite sign as its mirror image enantiomer.

3. Calculate the specific rotation of (S)-2-methoxypentane: Since the specific rotation of (R)-2-methoxypentane is -29.6, the specific rotation of (S)-2-methoxypentane will be the opposite sign with the same magnitude means +29.6.

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The solubility of KCl at 60 °C in 100 g of water (H2O) can be determined using experimental data or by using a solubility table. The solubility of a substance refers to the maximum amount of that substance that can dissolve in a given amount of solvent at a particular temperature and pressure.

One possible way to determine the solubility of KCl at 60 °C in 100 g of water is to consult a solubility table, which lists the solubility of various substances in water at different temperatures. According to one such table, the solubility of KCl in water at 60 °C is approximately 47 g per 100 g of water.

This means that 100 g of water at 60 °C can dissolve up to 47 g of KCl before becoming saturated, i.e., no more KCl will dissolve in the water at this temperature.

It is important to note that the solubility of KCl (or any substance) in water can be affected by various factors, such as temperature, pressure, and the presence of other solutes. Therefore, the solubility value obtained from a solubility table is only an approximation and may not be accurate for all conditions.

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The portion of the titration curve of a strong acid with a strong base that is the same as the region for a weak acid titrated with a strong base is the buffer region. The correct answer is option: d.

In this region, the pH of the solution changes very slowly as small amounts of base are added to the acid. The buffer region occurs when the amount of base added is roughly equal to the amount of acid in the solution. The other options mentioned, including the portion after all of the base has been neutralized, the endpoint pH are specific to either strong acid or weak acid titration curves and do not apply to both.

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The required gas volumes obtained at different pressures is a. [tex]279.825cm^3[/tex], b. [tex]0.804m^3[/tex], c. [tex]37.43cm^3[/tex], d. [tex]551.5cm^3[/tex] and e. [tex]200cm^3[/tex].

The ideal gas equation is a mathematical equation used to relate the four main properties of an ideal gas: pressure (P), volume (V), temperature (T), and moles of gas (n). It is expressed as PV = nRT, where R is the ideal gas constant. This equation is used to calculate the pressure, volume, and temperature of an ideal gas given any two of these properties.

a. Given [tex]338cm^3[/tex] at 86.1kPa to 104.0kPa

We can calculate this using the ideal gas law:

P1V1 = P2V2

86.1 * 338 = 104.0 * V2

V2 =[tex]279.825cm^3[/tex]

b. Given [tex]0.873m^3[/tex] at 94.3kPa to 102.3kPa

P1V1 = P2V2

(94.3) * (0.873) = (102.3) * V2

V2 = [tex]0.804m^3[/tex]

c. Given [tex]31.5cm^3[/tex] at 97.8kPa to 82.3kPa

P1V1 = P2V2

(97.8) * 31.5 = 82.3 * V2

V2 = [tex]37.43cm^3[/tex]

d. [tex]524cm^3[/tex] at 110.0kPa to 104.5kPa

P1V1 = P2V2

110.0 * 524 = 104.5 * V2

V2 = [tex]551.5cm^3[/tex]

e. [tex]171cm^3[/tex] at 122.5kPa to 104.3kPa

P1V1 = P2V2

122.5 * 171 = 104.3 * V2

V2 = [tex]200cm^3[/tex]

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The percent yield of a reaction is calculated by taking the amount of product produced and dividing it by the amount of reactant used, and then multiplying by 100 to get a percentage.

In this case, 55.0 g of ethene was produced from 100.0 g of ethanol, so the percent yield is 55.0 g divided by 100.0 g, multiplied by 100, which gives a percent yield of 55%.

This percent yield indicates the efficiency of the reaction, as the higher the percent yield, the more efficient the reaction is. A percent yield of 55% means that the reaction was relatively efficient, as the large majority of the reactant was converted into product. If the percent yield was much lower than this, it could indicate that there were some issues with the reaction and that it was not as efficient as it could be.

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From Lisa's experiment, it can be concluded that Tablet C was the best antacid among the four types tested, as it required the least amount of HCl to change the color of the indicator.

Indigestion tablets, also known as antacids, work by neutralizing excess stomach acid. Stomach acid is produced by the body to help digest food, but when there is an excess of acid, it can lead to indigestion, heartburn, and other uncomfortable symptoms.

This indicates that Tablet C was able to neutralize the acid effectively and had the highest buffering capacity compared to the other three tablets. Therefore, it can be recommended as the most effective antacid for treating indigestion.

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Image transcribed:

3. Lisa was investigating which of four different types of indigestion tablet neutralised most acid and was therefore the best 'antacid' of the four. She crushed each tablet to a fine powder, and added the powder to 20 mL of water mixed with two drops of universal indicator solution. Then she added 1 mL of dilute hydrochloric acid at a time until the indicator changed colour.

Lisa's results were:

Tablet A-16 mL

a. Put Lisa's results in a suitable table.

Tablet B-15 mL

Tablet C-8 mL

Tablet D-12 mL

The given statement "radioactive decay is a first-order kinetic process" is true because the number of radioactive nuclei that decay per unit time is proportional to the number of radioactive nuclei present.  

Radioactive decay is a natural process by which the unstable atomic nucleus loses energy by emitting radiation. This results in a change in the composition of the atomic nucleus, which is accompanied by a release of energy. The three types of radiation that can be emitted during radioactive decay are alpha particles, beta particles, and gamma rays.

Alpha particles are positively charged particles consisting of two protons and two neutrons, beta particles are negatively charged particles emitted by certain radioactive isotopes, and gamma rays are high-energy photons emitted by atomic nuclei during radioactive decay.

First-order kinetics is a type of chemical reaction in which the rate of reaction depends only on the concentration of one reactant. In other words, a first-order reaction is one in which the rate of reaction is proportional to the concentration of the reactant raised to the power of one. This means that the rate of reaction increases linearly with the concentration of the reactant. First-order kinetics is commonly observed in chemical and biochemical systems, as well as in radioactive decay.

In radioactive decay, the number of radioactive nuclei that decay per unit time is proportional to the number of radioactive nuclei present. This property of radioactive decay is called first-order kinetics.

Therefore, the given statement is true.

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1 mole of methane (CH₄) is burned it releases 461.9 KJ of heat then the ΔH for the combustion of 8.0 g of methane is 230.1 kJ.

To calculate the ΔH for the combustion of 8.0 g of methane, we need to first convert the mass of methane to moles.

The molar mass of methane (CH₄) is:

C: 12.01 g/mol

H: 1.01 g/mol

4 x H: 4.04 g/mol

Molar mass of CH₄ = 12.01 + 4.04 = 16.05 g/mol

So, 8.0 g of CH₄ is equal to:

n = m/M = 8.0 g / 16.05 g/mol = 0.498 moles of CH₄

Now, we can use the molar heat of combustion to calculate ΔH:

ΔH = n x ΔHcomb

ΔHcomb is the molar heat of combustion, which is given as 461.9 kJ/mol.

ΔH = 0.498 moles x 461.9 kJ/mol = 230.1 kJ

Methane is a chemical compound with the formula CH₄. It is a colorless, odorless, and flammable gas that is the primary component of natural gas. Methane is the simplest hydrocarbon and the main component of biogas and landfill gas. It is also a potent greenhouse gas and a major contributor to climate change. Methane is used as a fuel for heating, cooking, and electricity generation, as well as in industrial processes such as chemical synthesis and metal production.

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The type of soap affects its cleansing ability and dishwasher soap because of the specialized formulation of dishwasher soap, which is specifically designed to remove grease and dirt from dishes.

Here is an experiment that explores the effect of the type of soap on the cleanliness of dishes:

Title: The Effect of Soap Type on Dish Cleaning Performance

Introduction: Soap is a commonly used cleaning agent for removing dirt and grease from various surfaces, including dishes. There are different types of soap available in the market, each with its unique composition and cleaning properties. In this experiment, we will investigate the effect of soap type (shampoo, hand soap, dishwasher) on dish cleaning performance.

Hypothesis: We hypothesize that the type of soap used will have a significant effect on dish cleaning performance, with dishwasher soap being the most effective due to its specialized formulation.

Materials:

Three different types of soap (shampoo, hand soap, and dishwasher soap)

Measuring cup

Three identical dirty dishes

Sink with running water

Stopwatch

Paper towel

Digital scale

Procedure:

Measure out 30 mL of each soap type into separate containers.

Weigh each of the three dirty dishes using a digital scale and record the weights.

Wet one dish in the sink and apply 10 mL of the first soap type to the dish.

Rub the dish with a paper towel for 30 seconds.

Rinse the dish with running water for 10 seconds.

Dry the dish with a paper towel and weigh it. Record the weight and note the cleanliness of the dish.

Repeat steps 3-6 with the remaining two types of soap on the other two dishes.

Repeat steps 3-7 for each soap type two more times with new dirty dishes, for a total of three trials per soap type.

Data Analysis:

Calculate the difference in weight between the dirty and cleaned dishes for each trial.

Calculate the average weight difference for each soap type.

Plot the average weight difference for each soap type on a bar graph.

Analyze the graph to determine the effect of soap type on dish cleaning performance.

Conclusion:

Based on the results of this experiment, we can conclude that the type of soap used has a significant effect on dish cleaning performance. The dishwasher soap was found to be the most effective in cleaning dishes, followed by hand soap and then shampoo.

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The most dissolved H₂ (g) in H₂O (l) would occur under 101.3 kPa and 75°C.

The attraction between an electronegative atom serving as the hydrogen bond acceptor and a hydrogen atom covalently bonded to a more electronegative "donor" atom or group (Dn) is known as a hydrogen bond, or H-bond (Ac).Under 101.3 kPa and 75 °C, the maximum dissolved H2 (g) in H2O (l) would be present.At higher temperatures, the solvent molecules will have higher kinetic energy, allowing them to break the hydrogen bonds between the molecules and dissolve H₂ (g) more easily. At higher pressures, there will be more molecules of H₂ (g) in a given volume, increasing the chances of it dissolving into the solvent.

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The molarity of Tylenol is 0.21 M, rounded to two significant figures. Hence, the correct option is (B) i.e. 0.21 M.

To find the molarity of Tylenol, we need to know the number of moles of acetaminophen present in 5 mL of medicine.

First, let's calculate the molecular weight of acetaminophen:

C = 12.011 g/mol x 8 = 96.088 g/mol

H = 1.008 g/mol x 9 = 9.072 g/mol

N = 14.007 g/mol x 1 = 14.007 g/mol

O = 15.999 g/mol x 2 = 31.998 g/mol

Total molecular weight = 96.088 g/mol + 9.072 g/mol + 14.007 g/mol + 31.998 g/mol = 151.165 g/mol

Next, we can use the given mass of acetaminophen in 5 mL of medicine to calculate the number of moles:

0.16 g acetaminophen x (1 mol / 151.165 g) = 0.001058 mol

Finally, we can use the definition of molarity to calculate the molarity of Tylenol:

Molarity = moles of solute / volume of solution in liters

Since we have 0.001058 moles of acetaminophen in 5 mL of medicine, which is equivalent to 0.005 L of solution, we can calculate the molarity as:

Molarity = 0.001058 mol / 0.005 L = 0.2116 M

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If an air mass is rising, it must be less dense than the surrounding air.

If air mass is rising, it must be less dense than the surrounding air.

This is because when air rises, it is moving into an area of lower pressure than its initial location, which implies that there must be less air above it. Less air above means less weight above, hence resulting in lower density.

The less dense air mass will continue to rise until it reaches an altitude where it is equal in density to that of the surrounding air. This rising motion can lead to cloud formation and potentially precipitation, all depending on the moisture content of the air mass.

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To calculate the pH of a solution that results from mixing 22.6 mL of 0.23 M dimethylamine ((CH3)2NH) with 17.1 mL of 0.16 M (CH3)2NH2Cl, first we need to calculate the initial concentration of dimethylamine and the hydrogen ion. Then, the pH of the solution can be found from the hydrogen ion concentration.

To find the initial concentration of dimethylamine, use the following equation:

CDMA = (22.6 mL x 0.23 M) + (17.1 mL x 0.16 M)

CDMA = 7.868 M

To find the initial concentration of hydrogen ion, use the following equation:

CH+ = CDMA x Kb

CH+ = 7.868 M x 5.4 x 10-4

CH+ = 4.2632 x 10-3 M

To find the pH of the solution, use the following equation:

pH = -log [CH+]

pH = -log (4.2632 x 10-3)

pH = 2.37

Therefore, the pH of the solution that results from mixing 22.6 mL of 0.23 M dimethylamine ((CH3)2NH) with 17.1 mL of 0.16 M (CH3)2NH2Cl is 2.37.

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The volume of a gas will increase if the number of moles of gas is quadrupled at constant pressure and temperature: the volume of the gas will also increase four times its original volume.

This can be explained using the Ideal Gas Law, which states that the volume of a gas is proportional to the number of moles of gas when pressure and temperature remain constant. Therefore, if the number of moles of gas is increased by a factor of four, the volume of the gas will also increase by a factor of four.

To understand this concept better, let us consider the following example. Let us assume that there is a certain amount of gas, A, which contains one mole of gas at a constant pressure and temperature. This gas will occupy a certain volume, V1.

If the number of moles of gas is quadrupled to four moles, the volume of the gas will become four times the original volume, V2. Therefore, the volume of the gas, V2, is four times the original volume, V1.

This example demonstrates that if the number of moles of gas is increased at constant pressure and temperature, the volume of the gas will also increase proportionately. Therefore, if the number of moles of gas is quadrupled at constant pressure and temperature, the volume of the gas will also increase four times its original volume.

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According to Avogadro's Law, at constant temperature and pressure, the volume of a gas is directly proportional to the number of moles of gas. Therefore, if the number of moles of gas is quadrupled while keeping the temperature and pressure constant, the volume of the gas will also quadruple.

Mathematically, we can express this relationship as:

V ∝ n

where V is the volume of the gas, n is the number of moles of the gas, and the symbol ∝ means "is proportional to".

If we quadruple the number of moles of gas, then we have:

n' = 4n

where n' is the new number of moles of gas, and n is the original number of moles of gas.

Using the relationship between volume and number of moles, we can write:

V' ∝ n'

Substituting n' = 4n, we get:

V' ∝ 4n

Simplifying, we get:

V' = 4V

Therefore, if the number of moles of gas is quadrupled at constant pressure and temperature, the volume of the gas will also quadruple.

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Answer: A

Explanation: An exothermic reaction generates heat. Unless the reaction is cooled in some way, its temperature increases. If you increase the temperature with an external heater, it slows the reaction down or reverse its direction.

The statement "Metallic behavior correlates with large atomic size and low ionization energy. Thus, metallic behavior increases down a group and decreases from left to right across a period" is true.

The statement is true because metallic behavior correlates with large atomic size and low ionization energy. So, as you go down a group, the atomic size and ionization energy decrease, resulting in increased metallic behavior. As a result, when going from left to right across a period, the atomic size decreases, and the ionization energy increases, resulting in a decrease in metallic behavior.

As a result, the metallic behavior increases down a group and decreases from left to right across a period.

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The Ka for the weak acid is 2.45 x 10^-6 of concentration 0.0102m .

To calculate Ka, first, we need to calculate the concentration of H+ and the initial concentration of acid. The weak acid is monoprotic, meaning it can donate only one hydrogen ion (H+) to water.Therefore, it will dissociate as follows: HA + H2O ⇔ A- + H3O+where HA is the acid molecule, and A- is its corresponding conjugate base.

The H3O+ is also known as a hydronium ion. The first step is to calculate the concentration of H3O+.The pH of the solution is 2.68.Hence, pH = -log[H3O+]2.68 = -log[H3O+][H3O+] = 1.58 x 10^-3The concentration of H3O+ is 1.58 x 10^-3 M. Since the weak acid is monoprotic, the initial concentration of acid is equal to the concentration of the conjugate base of the weak acid, which we get from the dissociation equilibrium.

The equilibrium expression for the dissociation of a weak acid is given as follows: Ka = [A-][H3O+]/[HA]We need to find the value of Ka. We have already calculated the value of [H3O+].So, Ka = [A-][1.58 x 10^-3 M]/0.0102 MWe need to calculate the value of [A-].

From the equilibrium equation for weak acid: HA + H2O ⇔ A- + H3O+0.0102 M x1.58 x 10^-3 M Here, x is the concentration of A-.So, 1.58 x 10^-3 M = x, which is also the concentration of the conjugate base of the weak acid. So, Ka = [A-][H3O+]/[HA] = (1.58 x 10^-3 M)^2/0.0102 M= 2.45 x 10^-6Therefore, Ka for the weak acid is 2.45 x 10^-6.

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The statement "the cage size of the zeolites is in the centimeters scale" is False.

Zeolite is a crystalline and porous alumino-silicate mineral consisting of hydrated alkaline metals and alkali earth metals. These minerals have microporous structures that make them useful in industrial and medical applications, among other things. They have a diverse array of applications, including as catalysts, adsorbents, and molecular sieves. Zeolites are minerals that have a unique framework that is capable of trapping and holding a variety of molecules within their microporous structure.

Zeolites are small in size, typically between 0.3 and 2 microns. The cavities or pores within these crystals, known as cages, are in the range of 4 to 12 Angstroms in size (1 Angstrom = 0.1 nm). These cavities are small, which allows the zeolite to selectively filter molecules based on their size, shape, and chemical properties.}

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If Ascorbic acid (vitamin C, C6H8O6) is a diprotic acid (K1 =8.0x10^-5 and K2=1.6x10^-12). The pH of a 0.270 M solution of ascorbic acid is 4.10.

The two dissociation reactions for ascorbic acid are:

H2C6H6O6 ⇌ H+ + HC6H6O6- (K1 = 8.0x10^-5)

HC6H6O6- ⇌ H+ + C6H6O6 2- (K2 = 1.6x10^-12)

To solve the problem, we need to consider the ionization of both H+ ions from ascorbic acid. Let's call the concentration of H+ from the first ionization [H+]1, and the concentration of H+ from the second ionization [H+]2.

K1 = [H+]1 [HC6H6O6-] / [H2C6H6O6]

K2 = [H+]2 [C6H6O6 2-] / [HC6H6O6-]

Since ascorbic acid is a diprotic acid, we need to use the equilibrium expressions for both ionization reactions to determine the concentrations of H+ and the ascorbic acid species.

[H+]1 [HC6H6O6-] / [H2C6H6O6] = 8.0x10^-5

[H+]2 [C6H6O6 2-] / [HC6H6O6-] = 1.6x10^-12

We can assume that the concentration of ascorbic acid that dissociates is much larger than the concentration of H+ formed, so we can use the approximation [H+] << [H2C6H6O6] to simplify the calculations.

[H+]1 = K1 [H2C6H6O6] / [HC6H6O6-] ≈ K1 [H2C6H6O6] / [H2C6H6O6]

[H+]1 ≈ K1 = 8.0x10^-5

[H+]2 = K2 [HC6H6O6-] / [C6H6O6 2-] ≈ K2 [H+]1 [HC6H6O6-] / [C6H6O6 2-]

[H+]2 ≈ K2 [H+]1 = (1.6x10^-12) (8.0x10^-5) = 1.28x10^-16

The total concentration of H+ in the solution is [H+]1 + [H+]2, so the pH of the solution is:

pH = -log([H+]1 + [H+]2)

pH = -log(8.0x10^-5 + 1.28x10^-16)

pH = 4.10

Therefore, the pH of a 0.270 M solution of ascorbic acid is 4.10.

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The mass of [tex]SO_3[/tex] produced by reacting 6.3g of [tex]SO_2[/tex] with oxygen in the synthesis reaction is 7.875g.

Given the mass of [tex]SO_2[/tex] reacted = 6.3g

[tex]2SO_2(g) + O_2(g) -- > 2SO_3(g)[/tex]

We can see that 2 moles of [tex]SO_2[/tex] produce 2 moles of [tex]SO_3[/tex].

The mole ratio of [tex]SO_2[/tex] : [tex]SO_3[/tex] = 1 : 1

The molar mass of Sulfur dioxide = 64g/mol.

The number of moles of Sulfur dioxide reacted = 6.3/64 = 0.098mol

Since the mole ratio is 1 the moles of [tex]SO_3[/tex] produced = 0.098

The molar mass of Sulfur trioxide = 80g/mol

The mass of [tex]SO_3[/tex] produced = 0.098 * 80 = 7.875g

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First, we need to calculate the number of moles of aluminum that reacted:

Molar mass of aluminum = 27 g/mol

Number of moles of aluminum = 0.84 g / 27 g/mol = 0.031 mol

According to the balanced chemical equation, 2 moles of aluminum react with 3 moles of chlorine gas to produce 2 moles of aluminum chloride. So, 0.031 moles of aluminum will react with:

0.031 mol Al x (3 mol Cl2 / 2 mol Al) = 0.0465 mol Cl2

Now, we can use the molar gas volume to calculate the volume of chlorine gas used:

Volume of Cl2 = (0.0465 mol Cl2) x (24 dm³/mol) = 1.116 dm³ or 1116 mL (rounded to 3 significant figures)

Therefore, the volume of chlorine gas used in the reaction is 1.116 dm³ or 1116 mL.

The long will the reaction will take to reduce the concentration of to the 50% of its original value is 1386 sec. The option A is correct.

The expression is as :

d[N₂O₅] / dt = -0.0005 [N₂O₅]

[N₂O₅] (t) = [N₂O₅] (0) . e^-0.0005t

[N₂O₅](t) = Ce^-0.0005t

The reaction concentration of to the 50% of its original value is 0.5 C

0.5 C = Ce^-0.0005t

By dividing both side by C

0.5 = e^-0.0005t

Now taking the natural logarithm on the both side, we get

ln0.5 = lne^-0.0005t

ln 0.5 = - 0.0005t

t = - 0.693 / - 0.0005

t = 1386 sec

The time taken is 1386 sec. The correct option is A.

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Thus question is incomplete, the complete question is :

Experiments show that if the chemical reaction N2O5→2NO2+1/2O2, takes place at 45°C, the rate of reaction of dinitrogen pentoxide is proportional to its concentration as follows: -d[N2O5]/dt = 0.0005[N2O5] How long will the reaction take to reduce the concentration of N2O5 to 50% of its original value? select the correct answer. question 4 options:

A) t = 1386 sec

B) t = 211 sec

C) t = 2345 sec

D) t = 111 sec

The final concentration can be calculated from the dilutions mentioned and it is found to be 0.384 M.

To calculate the final concentration, we need to consider the dilution formula, which states that the initial concentration multiplied by the initial volume is equal to the final concentration multiplied by the final volume.

The first dilution can be calculated as:

C1 × V1 = C2 × V2

1.70 M × 64.0 mL = C2 × 268 mL

108.8 = 268 × C2

C2 = 108.8 ÷ 268

C2 = 0.406 M

This solution has again been diluted. Thus, now the final concentration will be calculated as:

C2 × V2 = C3 × V3

0.406 M × 268 mL = C3 × 283 mL

108.808 = 283 × C3

C3 = 108.808 ÷ 283

C3 = 0.384 M

Therefore, the final concentration of the solution is 0.384 M.

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