If a student weighs out 0.600 g of potassium hydrogen phthalate (MW 204.22 g/mol) and titrates it with sodium hydroxide solution, what is the molarity of the sodium hydroxide solution if it takes 32.21 mL of it to titrate the potassium hydrogen phthalate?

Hint: one mole of hydrogen phthalate reacts with one mole of sodium hydroxide.

Answer:

0.0924 mol Al₂O₃ = 9.42 g

0.0165 mol Be₃Al₂(SiO₃)₆ = 8.87 g

0.0380 mol MgAl₂(SiO₄)₃ = 13.5 g

Explanation:

mass = number of moles * molar mass

(PART A) The molar mass of Al₂O₃ is 101.96 g/mol. To find the mass in grams of Al₂O₃ that are in 0.0924 moles:

0.0924 mol * 101.96 g/mol = 9.42 g

(PART B) The molar mass of Be₃Al₂(SiO₃)₆ is 537.51 g/mol. To calculate the mass in grams of 0.0165 moles of Be₃Al₂(SiO₃)₆:

0.0165 mol * 537.51 g/mol = 8.87 g

(PART C) The molar mass of MgAl₂(SiO₄)₃ is 354.52 g/mol. To calculate the mass in grams of 0.0380 moles of MgAl₂(SiO₄)₃:

0.0380 mol * 354.52 g/mol = 13.5 g

The mass of ruby in grams is 9.43 g.
The mass of emerald in grams is 8.87 g.
The mass of garnet in grams is 16.56 g.

To calculate the mass of a compound in grams, we need to know the molar mass of the compound, which is the sum of the atomic masses of all the atoms in the formula. Once we know the molar mass, we can use the formula:

mass in grams = number of moles x molar mass

where the number of moles is given and the molar mass is calculated from the formula. In each case, we plug in the numbers and perform the calculation to obtain the mass in grams.

PART A: molar mass of Al₂O₃ is 101.96 g/mol (2 x 26.98 g/mol for Al and 3 x 16.00 g/mol for O).

As a result, the ruby mass in grammes is:

0.0924 moles x 101.96 g/mol = 9.43 g

PART B: The molar mass of Be₃Al₂(SiO₃)₆ is 537.54 g/mol (3 x 9.01 g/mol for Be, 2 x 26.98 g/mol for Al, 6 x 28.09 g/mol for SiO₃).

Therefore, The mass of an emerald in gram is :

0.0165 moles x 537.54 g/mol = 8.87 g

PART C: The molar mass of MgAl₂(SiO₄)₃ is 435.52 g/mol (1 x 24.31 g/mol for Mg, 2 x 26.98 g/mol for Al, 3 x 60.08 g/mol for SiO₄).

Therefore, the garnet mass in grams is :

0.0380 moles x 435.52 g/mol = 16.56 g

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10.0 mL of 0.115 M [tex]H_2SO_4[/tex] needs to be neutralised with 0.370 mL of a 0.310 M NaOH solution.

Calculate how much 0.310 M NaOH is required to neutralise 10.0 mL of 0.115 M [tex]H_2SO_4[/tex] in millilitres, we can apply the following formula:

Moles of [tex]H_2SO_4[/tex] = (Concentration of [tex]H_2SO_4[/tex])(Volume of [tex]H_2SO_4[/tex])

Moles of [tex]H_2SO_4[/tex] = (0.115 M)(10.0 mL) = 0.00115 moles

Since the reaction is 1 mole of [tex]H_2SO_4[/tex] to 2 moles of NaOH, we must have 0.00115 moles of NaOH to neutralize the [tex]H_2SO_4[/tex].

Moles of NaOH = (Concentration of NaOH)(Volume of NaOH)

0.00115 moles = (0.310 M)(Volume of NaOH)

Volume of NaOH =[tex]\frac{ 0.00115 moles}{0.310 M } = 0.370 mL[/tex]

Therefore, 0.370 mL of a 0.310 M NaOH solution are needed to neutralize 10.0 mL of 0.115 M [tex]H_2SO_4[/tex].

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The order of the arrangement of the wavelengths from strongest to weakest is;

447 > 492 > 588 > 668

The wavelength is a fundamental property of a wave and is related to its frequency and speed through the equation:

wavelength = speed of light / frequency

where the speed of light is approximately 299,792,458 meters per second (m/s) and the frequency is measured in Hertz (Hz), which represents the number of cycles per second.

The wavelength is an important concept in many areas of physics, including optics, acoustics, and electromagnetic radiation.

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The reaction's per cent yield is  69.5%.

We must compare the actual yield of the reaction to the theoretical yield of the reaction to get the per cent yield of the reaction.

First, we need to calculate the amount of Pb reacted using the given mass of Pb:

mass of Pb = 451.4 g

The molar mass of Pb is 207.2 g/mol, so the number of moles of Pb reacted is:

moles of Pb = mass of Pb / molar mass of Pb

moles of Pb = 451.4 g / 207.2 g/mol

moles of Pb = 2.179 mol

The theoretical yield of PbO can be calculated using the molar mass of PbO:

mass of PbO = moles of PbO × molar mass of PbO

mass of PbO = 2.179 mol × 223.2 g/mol

mass of PbO = 486.6 g

Therefore, the theoretical yield of PbO is 486.6 g.

The per cent yield of the reaction is:

per cent yield = (actual yield / theoretical yield) × 100%

per cent yield = (338.4 g / 486.6 g) × 100%

percent yield = 69.5%

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The difference between the energy needed to break the bonds in the reactants and the energy released when new bonds are created in the products is what essentially determines the enthalpy change.

In general, a bond must be broken by a positive change in enthalpy, whereas a bond must be formed by a negative change in enthalpy. In other words, the process of breaking a bond is endothermic, whereas the process of forming a bond is exothermic.

The energy needed to break the links between the reactants less the energy released during the formation of new bonds in the products is the enthalpy of reaction.

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In terms of bonds breaking and forming, what's responsible for the enthalpy change?

The numerical value of Kc for this reaction is 0.0804 if a 2.00 mol sample of A is sealed in a 1.00 L flask and allowed to reach equilibrium with B and C. The equilibrium concentration of B is found to be 0.39 M.

The equilibrium constant expression for the reaction A (g) ⇔ B (g) + C (g) is:

Kc = [B] [C] / [A]

where [A], [B], and [C] are the molar concentrations of A, B, and C at equilibrium, respectively.

We are given that the equilibrium concentration of B is 0.39 M. However, we are not given the equilibrium concentration of A or C. To solve for Kc, we need to find the equilibrium concentrations of all three species.

Since the reaction is in a 1.00 L flask and we started with a 2.00 mol sample of A, the initial concentration of A is 2.00 M. At equilibrium, the concentration of A will be equal to (2.00 - [B]) M, and the concentration of C will also be equal to [B] M (because the stoichiometric coefficients for B and C are equal).

Substituting these values into the equilibrium constant expression, we get:

Kc = (0.39 M)^2 / (2.00 M - 0.39 M) = 0.0804

Therefore, the numerical value of Kc for this reaction is 0.0804.

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When exposed to lead at high levels, the brain and central nervous system are attacked, resulting in unconsciousness, convulsions, and even death.

Lead poisoning affects up to 800 million children worldwide, or close to one third of all children. Lead has a negative impact on a child's developing brain, leading to diminished IQ, behavioral difficulties, and learning issues that can lower potential earnings as an adult.

The Safe Drinking Water Act (SDWA) reduced the maximum permitted lead level, or "lead-free" content, to a weighted average of 0.25 percent measured throughout the wetted surfaces of pipes, pipe fittings, plumbing fixtures, and fixtures, and 0.2 percent for solder and flux.

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What are the toxic effects of lead? How can it affect the human body?

The 37.2g of water must be heated from -15C to 135C using 23,447.04 joules of energy.

Heat transfer between two things is a result of their different masses. Heat transfer between two things is a result of their different densities. Heat transfer is a result of the temperature difference between two systems. Heat transmission between two objects is a result of pressure differences.

For calculating the heat:

Q = m × c × ΔT

Where:

Q = amount of heat (in joules)

m = mass of the substance (in grams)

c = specific heat capacity of the substance (in J/g·°C)

ΔT = change in temperature (in °C)

The specific heat capacity of water is approximately 4.184 J/g·°C.

Now, we have to calculate the change in temperature:

ΔT = final temperature - initial temperature

ΔT = 135⁰C - (-15⁰C)

ΔT = 150⁰C

Now, we can substitute the values,

Q = 37.2g × 4.184 J/g·°C × 150⁰C

Q = 23,447.04 J

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The correct conclusion is that the amount of water affects the mass and the height. This is evidenced by the data in the table, which shows that the plant in Pot B (which received more water) had more mass and was taller after 50 days of growth than the plant in Pot A.

Mass is a measure of the amount of matter an object contains. It is expressed in terms of a unit of measurement such as kilograms or pounds. Mass is different from weight, which is a measure of the force of gravity acting on an object. Mass is a constant, while weight can vary depending on the gravitational pull of the planet or other body on which the object is located. Mass is an intrinsic property of matter and is not affected by temperature or pressure. Mass is related to inertia, which is the resistance of an object to changes in its motion.

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The molarity of the sodium hydroxide solution is 0.0911 M.

We must figure out how many molecules of potassium hydrogen phthalate there are.

moles of KHP = mass / molar mass = 0.600 g / 204.22 g/mol = 0.00294 mol

We know that 0.00294 moles of NaOH were used in the titration because one mole of KHP interacts with one mole of NaOH. This data can be used to determine the molarity of the NaOH solution:

molarity of NaOH = moles of NaOH / volume of NaOH used in liters

volume of NaOH = 32.21 mL = 0.03221 L

calculation of  the molarity of NaOH:

molarity of NaOH = 0.00294 mol / 0.03221 L = 0.0911 M

The molarity of the sodium hydroxide solution is 0.0911 M.

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An endothermic reaction absorbs heat from the surroundings, so heat is a reactant in this case. According to Le Chatelier's principle, when a system in equilibrium is subjected to a change, it will adjust to counteract that change and maintain equilibrium.

What is Endothermic Reaction?

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings. In other words, the reaction requires energy in the form of heat to proceed, and the energy is absorbed from the surrounding environment, making it feel colder. Endothermic reactions usually have a positive enthalpy change, which means that the products have more energy than the reactants.

To shift the equilibrium of an endothermic reaction to the left, we need to remove heat, which can be achieved by decreasing the temperature. Therefore, the correct answer is (c) Decrease the temperature of the system.

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Introduction: The formation of the solar system has been a subject of scientific inquiry for centuries. One of the most significant forces at play in the formation of the solar system is the law of universal gravitation.

This law states that every object in the universe attracts every other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. In this virtual lab, we will investigate the law of universal gravitation by manipulating the size of the star and the positions of planets within Solar System X.

Hypothesis:

As the size of the star in Solar System X increases, the gravitational force experienced by the planets will increase, causing them to move closer to the star. Additionally, as the distance between the planets and the star decreases, the gravitational force experienced by the planets will also increase, causing them to move faster around the star.

Materials

Computer with internet connection

Virtual lab software

Solar System X simulation

Procedure:

Open the virtual lab software and access the Solar System X simulation.

Set the size of the star to the smallest setting and record the positions of the planets.

Increase the size of the star to the next setting and record the new positions of the planets.

Repeat step 3 until the largest size of the star is reached.

Analyze the data and record observations.

Results:

As the size of the star in Solar System X increased, the gravitational force experienced by the planets also increased. This caused the planets to move closer to the star and move faster around it. Additionally, as the distance between the planets and the star decreased, the gravitational force experienced by the planets also increased, causing them to move faster around the star. These observations support the hypothesis that the law of universal gravitation plays a significant role in the formation and movement of planets in a solar system.

Conclusion:

The law of universal gravitation is a fundamental force that plays a significant role in the formation and movement of planets in a solar system. This virtual lab demonstrated the effects of manipulating the size of the star and the positions of planets within Solar System X on the gravitational force experienced by the planets. The results of the experiment supported the hypothesis that increasing the size of the star and decreasing the distance between the planets and the star increased the gravitational force experienced by the planets, causing them to move faster and closer to the star. These observations provide valuable insight into the forces at play in the formation and movement of our own solar system and those found throughout the universe.

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Answer:

95.5 g/mol

Explanation:

To find the molar mass of the solute, we need to first calculate the number of moles of the solute in the solution.

Number of moles of solute = concentration x volume

We are given the concentration (0.400 m) and the volume (500 grams) of the solution, but we need to convert the mass of water to volume. We can do this using the density of water:

Density of water = 1 g/mL

Volume of water = mass of water / density of water = 500 g / 1 g/mL = 500 mL

Now we can calculate the number of moles of solute:

Number of moles of solute = 0.400 m x 500 mL = 200 mmol

Next, we need to find the mass of the solute:

Mass of solute = number of moles x molar mass

We are given the number of moles (200 mmol), so we can rearrange the equation to solve for the molar mass:

Molar mass = mass of solute / number of moles

Molar mass = 19.10 g / 200 mmol = 95.5 g/mol

Therefore, the molar mass of the solute is 95.5 g/mol.

Hopes this helps

The chemist's percent yield for this reaction is approximately 92.27%.

The percent yield for a chemical reaction is the ratio of the actual yield to the theoretical yield, expressed as a percentage. The theoretical yield is the amount of product that is expected to be obtained based on the stoichiometry of the reaction and the amounts of starting materials used. The actual yield is the amount of product that is actually obtained after the reaction is carried out and the product is purified.

To calculate the percent yield, we can use the formula:

Percent yield = (actual yield / theoretical yield) x 100%

In this case, the chemist calculated a theoretical yield of 216.4 g based on the amounts of starting materials used. However, she obtained an actual yield of 199.6 g after isolating and purifying the product.

So we can substitute these values into the formula and solve for the percent yield:

Percent yield = (199.6 g / 216.4 g) x 100%

Percent yield = 0.9227 x 100%

Percent yield = 92.27%

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Answer:

22.24°C.

Explanation:

The change in temperature of the iron can be calculated using the formula: ΔT = Q / (m * c), where ΔT is the change in temperature, Q is the heat added, m is the mass of the substance and c is the specific heat capacity.

Substituting the given values into the formula: ΔT = 115 cal / (47.0 g * 0.11 cal/g⋅°C) ≈ 22.24°C

So, the change in temperature of the iron is 22.24°C.

The rate of a chemical reaction can be calculated using its rate law and the concentrations of its reactants. The rate of reaction is 7.64 x 10⁻⁵ mol L⁻¹ s⁻¹.

The rate law for the given reaction is given as:

rate = (397 mol⁻² L² s¹) [A]²[B]

where [A] and [B] are the concentrations of reactants A and B, respectively.

We are given the concentrations of A and B as 0.0615 mol L⁻¹ and 0.583 mol L⁻¹, respectively. We can substitute these values into the rate law and solve for the rate of the reaction:

rate = (397 mol⁻² L² s¹) (0.0615 mol L⁻¹)² (0.583 mol L⁻¹)

rate = 7.64 x 10⁻⁵ mol L⁻¹ s⁻¹

Therefore, the rate of the reaction is 7.64 x 10⁻⁵ mol L⁻¹ s⁻¹.

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The volume of oxygen produced in the decomposition of 5 moles of KCIO3 at STP is 168 L. The balanced chemical equation for the decomposition of KCIO3 is:

2KClO3(s) → 2KCl(s) + 3O2(g)

From the equation, we can see that for every 2 moles of KCIO3, 3 moles of O2 are produced. Therefore, for 5 moles of KCIO3, the number of moles of O2 produced can be calculated as follows:

5 moles KCIO3 x (3 moles O2/2 moles KCIO3) = 7.5 moles O2

Since the conditions are given as STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to calculate the volume of O2 produced:

7.5 moles O2 x 22.4 L/mol = 168 L O2

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It is the least reactive of the three elements listed.  The correct order of elements from most to least reactive is:

sodium, carbon, krypton.

Sodium is a highly reactive metal and readily forms compounds with many other elements. It reacts vigorously with water and air, which is why it is stored in oil to prevent contact with moisture or oxygen.

Carbon is less reactive than sodium but can still undergo reactions, such as combustion or oxidation. Krypton, on the other hand, is a noble gas and is chemically inert, meaning it does not react with other elements under normal conditions. Therefore, it is the least reactive of the three elements listed.

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In comparison to the "P" alkalinity, the "T" alkalinity will be higher.

The "P" alkalinity of a sample is determined by the amount of hydrogen ions ([tex]H^+[/tex]) that are neutralized by the anions present. The "T" alkalinity of a sample is determined by the amount of hydroxide ions ([tex]OH^-[/tex]) that are neutralized by the cations present. In a sample where the only anion contributing to alkalinity is hydroxide ion, [tex]OH^-[/tex], the "P" alkalinity will be zero since there are no hydrogen ions ([tex]H^+[/tex]) to be neutralized. However, the "T" alkalinity will be equal to the amount of hydroxide ions ([tex]OH^-[/tex]) present since all of the [tex]OH^-[/tex] ions will be neutralized by the cations present. Therefore, in this case, the "T" alkalinity will be greater than the "P" alkalinity.

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Answer:Sodium

Explanation:Sodium has 11 protons, 11 nuetrons, and 12 electrons

Answer:

time = 1.92 min

Explanation:

By knowing that

[tex]R_R = K_R [A]^{1} = \frac{[A]}{time}[/tex]  

Where: RR: rate of forward reaction, KR: rate constant, [A]: A concentration

in the previous equation, [A] is cancelled, then:

[tex]K_R = \frac{1}{time} \\ \\[/tex]


[tex]8.70\times10^{-3} = \frac{1}{time}[/tex]


Then, time = 114.94 seconds = 1.92 minutes


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Answer:

a. The chemical equation for the reaction between CaI2 and K2SO4 is:

CaI2 + K2SO4 → 2 KI + CaSO4

The solubility product constant (Ksp) for CaSO4 is 2.4 x 10^-5 at 25°C.

Using the Ksp expression for CaSO4, we can write:

Ksp = [Ca2+][SO42-]

Let x be the concentration of Ca2+ ions in the solution. Then, the concentration of SO42- ions will also be x, since the reaction is 1:1. Substituting into the Ksp expression, we get:

Ksp = x^2

Solving for x, we get:

x = sqrt(Ksp) = sqrt(2.4 x 10^-5) = 0.0049 M

Therefore, the minimum concentration of CaI2 needed to cause precipitation is 0.0049 M.

b. The chemical equation for the reaction between AgNO3 and RbCl is:

AgNO3 + RbCl → AgCl + RbNO3

The solubility product constant (Ksp) for AgCl is 1.8 x 10^-10 at 25°C.

Using the Ksp expression for AgCl, we can write:

Ksp = [Ag+][Cl-]

Let x be the concentration of Ag+ ions in the solution. Then, the concentration of Cl- ions will also be x, since the reaction is 1:1. Substituting into the Ksp expression, we get:

Ksp = x^2

Solving for x, we get:

x = sqrt(Ksp) = sqrt(1.8 x 10^-10) = 1.34 x 10^-5 M

Therefore, the minimum concentration of AgNO3 needed to cause precipitation is 1.34 x 10^-5 M.

Answer:

2.67 x 10^-4 M & 8.85 x 10^-8 M

Explanation:

The minimum concentration of the precipitating agent required to cause precipitation of the cation from the solution can be determined using the solubility product constant (Ksp) of the salt that would be formed. The Ksp is an equilibrium constant that represents the maximum amount of solid that can dissolve in water to form a saturated solution.

For part a, calcium iodide (CaI2) and potassium sulfate (K2SO4) are mixed. The reaction that occurs is:

CaI2(aq) + K2SO4(aq) → CaSO4(s) + 2KI(aq)

The solubility product constant for calcium sulfate (CaSO4) is 2.4 x 10^-5. Let x represent the minimum concentration of K2SO4 required to cause precipitation. The concentration of Ca2+ ions in solution is 9.0 x 10^-2 M. The Ksp expression for CaSO4 is:

Ksp = [Ca2+][SO42-]

Substituting the known values gives:

(2.4 x 10^-5) = (9.0 x 10^-2)(x)

Solving for x gives:

x = (2.4 x 10^-5)/(9.0 x 10^-2)

x = 2.67 x 10^-4 M

So, the minimum concentration of K2SO4 required to cause precipitation of CaSO4 is 2.67 x 10^-4 M.

For part b, silver nitrate (AgNO3) and rubidium chloride (RbCl) are mixed. The reaction that occurs is:

AgNO3(aq) + RbCl(aq) → AgCl(s) + RbNO3(aq)

The solubility product constant for silver chloride (AgCl) is 1.77 x 10^-10. Let y represent the minimum concentration of RbCl required to cause precipitation. The concentration of Ag+ ions in solution is 2.0 x 10^-3 M. The Ksp expression for AgCl is:

Ksp = [Ag+][Cl-]

Substituting the known values gives:

(1.77 x 10^-10) = (2.0 x 10^-3)(y)

Solving for y gives:

y = (1.77 x 10^-10)/(2.0 x 10^-3)

y = 8.85 x 10^-8 M

So, the minimum concentration of RbCl required to cause precipitation of AgCl is 8.85 x 10^-8 M.

Answer:

The balanced chemical equation for the reaction is:

CS2 + 3 Cl2 ➡️ CCl4 + S2Cl2

According to the equation, one mole of CS2 reacts with three moles of Cl2 to produce one mole of CCl4. The molar mass of CS2 is 76.14 g/mol, and the molar mass of CCl4 is 153.82 g/mol.

Theoretical yield of CCl4:

125 g CS2 × (1 mol CS2/76.14 g) × (1 mol CCl4/1 mol CS2) × (153.82 g CCl4/1 mol CCl4) = 318.3 g CCl4

This means that 318.3 g of CCl4 should have been produced according to the balanced equation.

Actual yield of CCl4 = 60.4 g

Percent yield = (actual yield / theoretical yield) × 100%

Percent yield = (60.4 g / 318.3 g) × 100%

Percent yield = 19%

Therefore, the percent yield of CCl4 is 19%.

Answer:

D

The temperature an object would be if its molecules were completely still. Absolute zero is the lowest possible temperature that can be achieved, at which the particles of matter would have zero thermal energy and all molecular motion would stop.

Explanation:

The process is called bleaching. Chlorine gas (Cl2) reacts with water to form hypochlorous acid (HOCl) and hydrochloric acid (HCl). Hypochlorous acid acts as a powerful oxidizing agent and removes electrons from the red litmus paper, causing it to turn white.

Answer:

the concentration of sodium nitrate in the solution is 0.470 M.

Explanation:

To calculate the concentration of sodium nitrate in the solution, we need to first convert the mass of solid sodium nitrate to moles. We can do this using the molar mass of NaNO3, which is 85.0 g/mol:

moles NaNO3 = mass NaNO3 / molar mass NaNO3

moles NaNO3 = 2.00 g / 85.0 g/mol

moles NaNO3 = 0.0235 mol

Next, we need to calculate the total volume of the solution in liters, since concentration is usually expressed in moles per liter (M):

volume solution = 50.0 mL / 1000 mL/L

volume solution = 0.0500 L

Finally, we can use the moles of sodium nitrate and the total volume of the solution to calculate the concentration in moles per liter:

[NaNO3] = moles NaNO3 / volume solution

[NaNO3] = 0.0235 mol / 0.0500 L

[NaNO3] = 0.470 M

Therefore, the concentration of sodium nitrate in the solution is 0.470 M.

The vapor pressure of the solution at 30°C is 0.9676781. The pressure that a vapor exerts on its condensed phases (solid or liquid) in a closed system at a specific temperature is known as vapor pressure.

The pressure of the solvent above the solution is known as the vapour pressure of a solution. Temperature, ambient pressure, and solute concentration all have an impact on a solution's vapour pressure. A manometer or a barometer can be used to determine a solution's vapour pressure. When a liquid is contained in a closed container, its molecules frequently crash into the walls of the container. Due to these collisions, the container's walls experience pressure equal to the liquid's vapour pressure.

Solution of P = (0.9677 x 31.8 mmHg)

P solution = 30.8 mmHg

X Solvent = 34.63588 mol/1.156 + 34.635

X Solvent = 0.9676781

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Answer:

Explanation:

Average Atomic Mass

In order to find the identity of the element, we must first find the average mass of all isotopes.

To do this, we multiply each mass by its percent abundance and add them together.

[tex](0.0435*49.9461)+(0.8379*51.9405)+(0.0950*52.9407)+(0.0236*53.9389)=51.9959[/tex]

51.9959 is the calculated average of the mass of each isotope.

Identity

Looking at a periodic table, this value for atomic mass most closely resembles the atomic mass of Chromium, which is 51.9961

The value of the equilibrium constant, Kc is 0.33.

The correct option is A.

The balanced chemical equation for the oxidation of NO by O2 is:

2 NO (g) + O2 (g) → 2 NO2 (g)

From the stoichiometry of the equation, we see that the mole ratio of NO to O2 consumed is 2:1. Therefore, if 3 moles of O2 are present at equilibrium, then 1.5 moles of NO have been consumed:

1.5 moles NO = 15.0 moles NO (initial) - 3.0 moles NO2 - 3.0 moles O2

Using the law of mass action, we can express the equilibrium constant (Kc) for the reaction as:

Ke = ([NO2]^2 / [NO]^2 [O2])

We know that at equilibrium, [O2] = 3.0 moles / 1.0 L = 3.0 M. To calculate [NO2], we need to use the stoichiometry of the equation and the fact that 1.5 moles of NO are consumed at equilibrium:

2 mol NO → 2 mol NO2

1.5 mol NO → 1.5 mol NO2

Therefore, [NO2] = 1.5 mol NO2 / 1.0 L = 1.5 M. Substituting the values into the equilibrium constant expression, we get:

Ke = ([NO2]^2 / [NO]^2 [O2])

Ke = (1.5 M)^2 / (1.5 M)^2 (3.0 M)

Ke = 0.333

Therefore, the answer is (a) 0.33.

Learn more about equilibrium constant, Kc at: https://brainly.com/question/19340344

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