What is the minimum voltage needed to cause the electrolysis cacl2?

Set of coefficients that will balance the chemical equation is: A. 1,5,3,4

Combustion is a chemical reaction that occurs when fuel combines with oxidant to produce heat and light. The fuel is a hydrocarbon, such as methane or propane, while oxidant is oxygen from the air. During combustion, hydrocarbon is oxidized to produce carbon dioxide and water vapor, releasing energy in form of heat and light.

The balanced chemical equation for the combustion of propane is: C₃H₈ (g) + 5O₂ (g) → 3CO₂ (g) + 4H₂O (l)

So the correct set of coefficients to balance equation is option A: 1, 5, 3, 4.

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Answer:

1.503 x 10^23

Explanation:

your question was how many atoms, so you have to multiply that number which is how many molecules by 8 atoms per molecule of sulphur. So you get 1.503 x 10^23 atoms in 8 grams of sulfur.

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11.1384 with 4 significant figures. The answer is rounded to the fourth significant figure because the number given in the equation, 0.1159, contains 4 significant figures.

Figures are visual images or representations used to convey information. They are often used in the sciences, mathematics, engineering, and other technical fields to convey complex data or ideas. Figures can also be used in literature, art, and other creative forms to illustrate stories or themes. Figures can be drawn, photographed, or computer-generated. They are often used to represent statistical information, such as graphs and charts, as well as to illustrate mathematical equations. In the arts, figures can be used to convey a narrative or express an emotion. For example, an artist may use a figure to express the beauty of a landscape or the sorrow of a particular situation. Figures are an effective way to communicate complex concepts and ideas in a concise and visually appealing way.

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(a) To determine if this can be done, we need to calculate the maximum amount of polysilicon that can be etched while keeping the SiO2 removal below 50 Å.

Let's assume the initial thickness of SiO2 is 1000 Å. Since the selectivity is 30, the maximum amount of polysilicon that can be etched is:

50 Å * (1/30) = 1.67 Å

Now, taking into account the overetch of 10%, the total amount of polysilicon that can be etched is:

1.67 Å / (1-0.1) = 1.85 Å

So, we need to etch a maximum of 1.85 Å of polysilicon.

The total thickness of the polysilicon and SiO2 layers is:

0.35 um + 1000 Å = 1350 Å

To find the required polysilicon uniformity, we can use the following equation:

(1 - uniformity) * 0.35 um = 1.85 Å

Solving for uniformity, we get:

uniformity = 1 - (1.85 Å / 0.35 um) = 0.9947 or 99.47%

So, the required polysilicon uniformity is 99.47%.

(b) To find the maximum polysilicon film thickness, we can use the same approach as above.

Let's assume the initial thickness of SiO2 is 1000 Å. The maximum amount of polysilicon that can be etched is:

50 Å * (1/30) = 1.67 Å

The total thickness of the polysilicon and SiO2 layers cannot be less than:

1000 Å + 50 Å + 1.67 Å = 1051.67 Å

So, the maximum polysilicon film thickness is:

1051.67 Å - 1000 Å = 51.67 Å

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A graduated cylinder is a piece of laboratory equipment used for measuring the volume of liquids, and in this case, it has a capacity of 10 ml.

The gram scale, on the other hand, is a device used for measuring the mass of objects and materials. To begin the experiment, you will need to first measure the mass of the empty graduated cylinder using the gram scale. This will give you a baseline measurement for the weight of the cylinder without any additional substances. You should record this value for future reference.

Next, you will need to fill the graduated cylinder with water up to the 10 ml mark. This can be done by slowly pouring the water into the cylinder until the level reaches the desired volume.

After filling the cylinder with water, you will need to measure the mass of the cylinder and the water together using the gram scale. Subtract the mass of the empty cylinder from the total mass to find the mass of the water.

Finally, you will need to add the six metal paper clips of the same size and material to the cylinder and measure the mass again. This will allow you to determine the difference in mass between the water and the paper clips.

Overall, this experiment demonstrates the use of laboratory equipment to measure the volume and mass of substances, and highlights the importance of accurate measurements in scientific research.

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197.4 grams of oxygen gas is consumed during the combustion of propane. Using stoichiometry, it is calculated that 88.43 grams of water vapor is produced as a result.

The balanced chemical equation for the combustion of propane is:

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

From the equation, we can see that for every mole of propane (C₃H₈) consumed, 4 moles of water (H₂O) are produced.

To solve the problem, we need to first find the number of moles of oxygen (O₂) consumed:

Moles of O₂ = Mass of O₂ / Molar mass of O₂

Molar mass of O₂ = 32 g/mol (from the periodic table)

Moles of O₂ = 197.4 g / 32 g/mol

Moles of O₂ = 6.16875 mol

Since the balanced chemical equation shows that 5 moles of O₂ are required for every mole of C₃H₈, we can find the number of moles of C₃H₈ consumed:

Moles of C₃H₈ = Moles of O₂ / 5

Moles of C₃H₈ = 6.16875 mol / 5

Moles of C₃H₈ = 1.23375 mol

Now, we can find the number of moles of H₂O produced:

Moles of H₂O = Moles of C₃H₈ x 4

Moles of H₂O = 1.23375 mol x 4

Moles of H₂O = 4.935 mol

Finally, we can find the mass of H₂O produced:

Mass of H₂O = Moles of H₂O x Molar mass of H₂O

Molar mass of H₂O = 18 g/mol (from the periodic table)

Mass of H₂O = 4.935 mol x 18 g/mol

Mass of H₂O = 88.43 g

Therefore, 88.43 grams of water vapor is produced as a result of the combustion of propane with 197.4 grams of oxygen gas.

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Yes, silver would still be considered an ore even if its demand and usage in digital technology, gold jewelry, and paper money decreased to the point of non-existence. Silver is a naturally occurring metallic element that is found in various ores, and its classification as an ore is based on its physical and chemical properties, regardless of its market demand. Therefore, even if the uses of silver in various industries decline, it would still be classified as an ore.

An ore is a naturally occurring mineral or rock containing valuable substances, typically metals, that can be extracted through mining and processed for various purposes. Even if the demand for silver decreases due to digital technology, gold jewelry, and paper money, it would not change the fact that silver is a naturally occurring material containing a valuable metal. The classification of silver as an ore is independent of its current or potential use in human activities.

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Delta Hfusion is a term used in thermodynamics to refer to the amount of energy that is required to convert a substance from its solid state to its liquid state, or vice versa, at a constant pressure. This energy is typically expressed in terms of Joules per unit mass, such as J/g or kJ/kg.

To calculate the volume of liquid that is frozen, we first need to determine the amount of mass that is required to produce 1 kJ of energy. This can be calculated using the equation:
q = m * Delta Hfusion

where q is the amount of energy produced (in J), m is the mass of the substance being frozen (in kg), and Delta Hfusion is the amount of energy required to freeze the substance (in J/kg). Rearranging this equation to solve for m, we get:

m = q / Delta Hfusion

Substituting the values of q = 1 kJ and Delta Hfusion (which is a known value for the substance being frozen), we can calculate the mass of the substance required to produce 1 kJ of energy. Once we know the mass, we can use the density of the substance to calculate the volume of liquid that is frozen.

For example, let's say we are trying to freeze water to produce 1 kJ of energy. The Delta Hfusion of water is 333.6 kJ/kg. Using the equation above, we can calculate the mass of water required to produce 1 kJ of energy:

m = (1 kJ) / (333.6 kJ/kg) = 0.003 kg
Next, we can use the density of water (which is approximately 1000 kg/m^3) to calculate the volume of water that is frozen:
Volume = mass / density = 0.003 kg / 1000 kg/m^3 = 0.000003 m^3

So, the volume of water that is frozen to produce 1 kJ of energy is approximately 0.000003 cubic meters, or 3 milliliters.In summary, we can use the Delta Hfusion of a substance, along with its density, to calculate the volume of liquid that is frozen to produce a certain amount of energy.

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Answer:To determine the number of valence electrons in an atom of a representative element, you can look at its position on the periodic table. Representative elements are also known as the main group elements and are located in groups 1-2 and 13-18 of the periodic table.

The number of valence electrons in an atom of a representative element is equal to the group number. For example, the elements in group 1 (also known as the alkali metals) have 1 valence electron, while the elements in group 2 (the alkaline earth metals) have 2 valence electrons. The elements in group 13 (the boron group) have 3 valence electrons, and so on, up to group 18 (the noble gases), which have a full set of 8 valence electrons (except for helium, which has only 2).

For example, let's consider the element sodium (Na), which is in group 1. Sodium has 1 valence electron because it is in group 1. Similarly, the element carbon (C), which is in group 14, has 4 valence electrons because it is in group 14.

Knowing the number of valence electrons in an atom is important because it helps to determine the chemical properties and reactivity of the element. Atoms with the same number of valence electrons tend to have similar chemical properties and can form similar types of chemical bonds.

Explanation:

Based on the texts, both authors would most likely agree that Lewis's works are varied in the subjects they depict.

Option B is correct.

C. S. Lewis FBA has some notable works such as The Chronicles of Narnia, Mere Christianity The Allegory of Love, The Screwtape Letters, The Abolition of Man, The Space Trilogy Till We Have Faces Surprised by Joy: The Shape of My Early Life.

This statement indicates that Edmonia Lewis created works in a range of subjects, which is supported by her sculpting of both historical and contemporary figures, as well as mythological and biblical scenes.

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The formula for calculating the amount of energy required to raise the temperature of a substance is:

q = m * c * ΔT

where q is the amount of energy, m is the mass of the substance, c is the specific heat, and ΔT is the change in temperature.

We can rearrange this formula to solve for the mass of the metal:

m = q / (c * ΔT)

Substituting the given values, we get:

m = 832 J / (0.466 J/g*C * (71oC - 65oC))

m = 832 J / (0.466 J/g*C * 6oC)

m = 832 J / 2.796 J/g

m = 297.1387678 g

Rounding to five significant figures, the mass of the metal sample is 297.14 g.

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The type of radiation most likely used in a smoke detector is alpha radiation.

Alpha radiation is used in smoke detectors because it can be easily stopped by small smoke particles. Americium-241, a radioactive element, emits alpha particles which ionize the air, creating a small electric current. When smoke enters the detector, it absorbs the alpha particles, disrupting the current and triggering the alarm.

Alpha radiation is ideal for this application as it has a low penetration power, meaning even small particulates like smoke can stop its travel, ensuring the detector's sensitivity to smoke. Additionally, alpha radiation poses a minimal risk to human health when contained properly within the device.

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The DART system and sensors have several advantages over seismometers and coastal tide gauges in measuring tsunami-related events. Three advantages are Real-time measurement, Wide coverage and High accuracy.

Real-time measurement: The DART system provides real-time measurements of the height and speed of waves in the open ocean, whereas seismometers and coastal tide gauges only measure the arrival time and amplitude of waves at a specific location. Real-time measurements allow for more accurate and timely predictions of tsunami-related events, enabling earlier warning and faster response times.

Wide coverage: The DART system covers a larger area than seismometers and coastal tide gauges, allowing for more comprehensive monitoring of oceanic waves. The wider coverage allows for more accurate prediction of the direction, speed, and strength of tsunamis, reducing the risk of false alarms and missed warnings.

High accuracy: The DART system is designed to measure the height and speed of waves with high accuracy, providing detailed information on the magnitude and severity of tsunamis. This level of accuracy can improve predictions by providing more precise estimates of the extent of damage and the areas at risk, enabling more effective disaster planning and response.

Overall, the DART system and sensors offer significant advantages over traditional seismometers and coastal tide gauges, providing more accurate and timely predictions of tsunami-related events, enabling faster response times, and reducing the risk of false alarms and missed warnings.

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The heat evolved when 27.5 g of ammonia gas condenses to a liquid at its boiling point is -37.8 kJ.

First, we need to calculate the amount of heat required for the ammonia gas to condense. The heat of vaporization of ammonia is 23.4 kJ/mol. The molar mass of ammonia is 17.03 g/mol, so we have:

23.4 kJ/mol x (27.5 g / 17.03 g/mol) = 37.8 kJ

This means that 37.8 kJ of heat is required for 27.5 g of ammonia gas to condense. However, since the question asks for the heat evolved, we need to reverse the sign of the answer.

Thus, the amount of heat released as 27.5 grams of gaseous ammonia undergoes condensation at its boiling point is equal to -37.8 kJ.

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pH = 6.00: 0, 1, 2, 3, 4, 5 will not precipitate.

pH = 8.00: 0, 1, 2, 3, 4, 5 will not precipitate.

To determine the pH at which Cu(OH)₂ begins to precipitate, we need to calculate the hydroxide ion concentration at which the product of [Cu²⁺] and [OH⁻]² reaches the Ksp value of Cu(OH)₂ (2.2e⁻²⁰). At this point, Cu(OH)₂ will begin to precipitate. Thus, we have:

Therefore, Cu(OH)₂ begins to precipitate at a pH of 6.3.

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Answer:

First, we need to calculate the number of moles of nitrogen gas required to form a monolayer:

n = (pv) / (rt)

where p is the pressure, v is the volume, r is the ideal gas constant, and t is the temperature in Kelvin.

At standard temperature and pressure, we have:

p = 1 atm

v = 7.6×10^3 mm^3 = 7.6×10^-6 m^3

t = 273 K

r = 8.31 J/(mol K)

So, n = (1 atm x 7.6×10^-6 m^3) / (8.31 J/(mol K) x 273 K) = 3.13×10^-7 mol

Next, we can calculate the number of nitrogen molecules in this amount of gas:

N = n x Na

where Na is Avogadro's number (6.02×10^23 molecules/mol).

N = 3.13×10^-7 mol x 6.02×10^23 molecules/mol = 1.88×10^17 molecules

Finally, we can calculate the surface area of the catalyst covered by these molecules:

A = N x a

where a is the area covered by a nitrogen molecule (0.162 nm^2), converted to m^2.

a = 0.162 nm^2 x (10^-18 m^2/nm^2) = 1.62×10^-20 m^2

A = 1.88×10^17 molecules x 1.62×10^-20 m^2/molecule = 3.05×10^-3 m^2

Therefore, the surface area of the catalyst covered by the nitrogen molecules is approximately 3.05×10^-3 m^2.

The total pressure inside the container is 4.00 atm. This is because the total pressure of a gas mixture is equal to the sum of the individual pressures of each gas present. In this case, we have 2.50 atm of N2 gas and 1.50 atm of O2 gas.

When these two values are added together, we get the total pressure of 4.00 atm. This total pressure is also known as the partial pressure of the gas mixture.

The partial pressure of the gas mixture is the sum of the individual partial pressures of each gas present. Since the total pressure of a gas mixture is equal to the sum of the individual pressures of each gas present, the total pressure in the container is 4.00 atm.

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That statement "Heterocyclic aromatic compounds undergo electrophilic aromatic substitution in a similar fashion to that undergone by benzene with the formation of a resonance-stabilized intermediate." is generally true.

Heterocyclic aromatic compounds, like benzene, contain a ring of atoms with alternating double bonds (pi bonds) and exhibit delocalized pi electrons that are responsible for their aromaticity.

Electrophilic aromatic substitution is a common reaction for these types of compounds, where an electrophile is attracted to the electron-rich ring and substitutes for one of the hydrogen atoms.

The resulting intermediate is a resonance-stabilized carbocation, just like in the case of benzene.

However, the reactivity and selectivity of heterocyclic aromatic compounds may differ from that of benzene due to differences in the electronic properties of the heteroatom(s) in the ring and their effect on the ring's electron density.

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The reaction between hydrochloric acid ([tex]HCl[/tex]) and sodium hydroxide ([tex]NaOH[/tex]) is a classic example of an acid-base neutralization reaction. In this reaction, the hydrogen ions ([tex]H+[/tex]) in the acid react with the hydroxide ions ([tex]OH-[/tex]) in the base to form water ([tex]H2O[/tex]) and a salt, which in this case is sodium chloride ([tex]NaCl[/tex]).

The balanced chemical equation for the reaction is:

[tex]HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)[/tex]

So, the substance that is always produced in the reaction between hydrochloric acid and sodium hydroxide is water and a salt, which is sodium chloride. This reaction is exothermic and the heat released during the reaction can be used to increase the temperature of the solution.

This reaction is widely used in the chemical industry for various applications such as neutralizing acidic waste, producing table salt, and in the production of soap and detergents.

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Copper (Cu) is oxidized, and Nitrogen (N) is reduced.

The element that is oxidized or reduced is calculated as follows;

Cu + HNO3 → Cu(NO3)2 + NO + H2O

Oxidation is the loss of electrons, whereas reduction is the gain of electrons.

In the given reaction, copper (Cu) is oxidized as it loses two electrons, going from an oxidation state of 0 to +2 in Cu(NO3)2.

On the other hand, nitrogen in HNO3 undergoes a change in oxidation state from +5 to +2, indicating that it has gained three electrons and hence, is reduced to NO.

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Limiting reactant in the given condition is Carbon, Moles of CO formed is 2.40 mol and moles of H2 formed is 2.40 mol

To determine the limiting reactant, we need to compare the amount of each reactant to their stoichiometric coefficients in the balanced chemical equation. The balanced equation for the reaction between carbon and steam is:

C (s) + H2O (g) → CO (g) + H2 (g)

The stoichiometric coefficients tell us that 1 mole of carbon reacts with 1 mole of steam to produce 1 mole of carbon monoxide and 1 mole of hydrogen gas.

So, for 2.40 moles of carbon, we need 2.40 moles of steam to react completely. However, we only have 3.10 moles of steam available, which means that steam is in excess and carbon is the limiting reactant.

To find the number of moles of products formed, we use the stoichiometric coefficients. Since carbon is the limiting reactant, we can use its amount to determine the theoretical yield of products.

From the balanced equation, 1 mole of carbon produces 1 mole of CO and 1 mole of H2. Therefore, 2.40 moles of carbon will produce 2.40 moles of CO and 2.40 moles of H2.

So, the answer to the question is:
Limiting reactant: Carbon
Moles of CO formed: 2.40 mol
Moles of H2 formed: 2.40 mol

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The molarity of the solution is 0.5 M.

To calculate the molarity of the solution, we need to first calculate the number of moles of NaF present in the solution. The molar mass of NaF is 41.99 g/mol (22.99 g/mol for Na and 19.00 g/mol for F).

Number of moles of NaF = mass of NaF / molar mass of NaF

= 15.1 g / 41.99 g/mol

= 0.359 mol

The volume of the solution is given as 550.0 mL, which needs to be converted to liters (L) as the unit of molarity is moles/L.

Volume of the solution = 550.0 mL = 0.5500 L

Molarity of the solution = number of moles of solute / volume of solution

= 0.359 mol / 0.5500 L

= 0.653 M

However, we need to consider that the NaF was diluted to a final volume of 550.0 mL, which means that the concentration of the solution has been decreased. Therefore, we need to divide the calculated molarity by 2.

Molarity of the solution after dilution = 0.653 M / 2

= 0.5 M

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Answer:

0.08 atm

Explanation:

The pressure change of a gas at constant volume can be determined using the ideal gas law:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

Since the volume is constant, we can simplify the ideal gas law to:

P = (nRT) / V

The number of moles and the gas constant are constant for a given sample of gas, so we can further simplify to:

P1 / T1 = P2 / T2

Where P1 and T1 are the initial pressure and temperature, and P2 and T2 are the final pressure and temperature.

Plugging in the given values:

P1 = 2.50 atm

T1 = 30.0 + 273.15 = 303.15 K

T2 = 40.0 + 273.15 = 313.15 K

P2 = (P1 * T2) / T1

P2 = (2.50 atm * 313.15 K) / 303.15 K

P2 = 2.58 atm

Therefore, the pressure change when a constant volume of gas at 2.50 atm is heated from 30.0 °C to 40.0 °C is 0.08 atm (2.58 atm - 2.50 atm).

Answer:

Explanation: 0.08

When we place a metal spoon and a wooden spoon of equal masses/size in a boiling pot of water for the same amount of time, the metal spoon would likely be more painful to grab than the wooden spoon. This is because of the differences in their specific heat capacities.

Specific heat capacity is the amount of heat required to raise the temperature of a substance by 1 degree Celsius per unit mass. Metals have a lower specific heat capacity than wood, which means that they require less heat to increase their temperature than wood does.

As a result, the metal spoon would heat up more quickly than the wooden spoon in the boiling water.

Heat flow is the transfer of thermal energy from one object to another due to a temperature difference between them. In this case, heat flows from the boiling water to the spoons. The metal spoon would conduct heat better than the wooden spoon due to its higher thermal conductivity.

This means that the metal spoon would transfer heat more quickly from the boiling water to your hand, making it more painful to grab.

Mass is also a factor to consider as it affects the amount of heat absorbed by the spoons. However, since the spoons have equal masses, mass does not play a significant role in this scenario.

In summary, the metal spoon would likely be more painful to grab because it has a lower specific heat capacity and higher thermal conductivity than the wooden spoon, which causes it to heat up more quickly and transfer heat more efficiently from the boiling water to your hand.

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The new pressure be and in which direction would air flow is 1140 mmHg.

Using Boyle's law, we know that the pressure and volume of a gas are inversely proportional. Therefore, if the volume of the alveolus decreases from 3 ml to 2 ml, the pressure inside the alveolus will increase by a factor of 3/2 or 1.5 times. The new pressure inside the alveolus will be 760 mmHg x 1.5 = 1140 mmHg.

According to the principles of gas flow, air moves from an area of higher pressure to an area of lower pressure. Therefore, in this scenario, air would flow out of the alveolus since the pressure inside the alveolus (1140 mmHg) is now higher than the atmospheric pressure outside the body (760 mmHg).

It's important to note that this scenario assumes that all other factors affecting the pressure inside the alveolus, such as temperature and the number of gas molecules, remain constant.

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A solubility curve is a graphical representation of the solubility of a substance in a specific solvent as a function of temperature.

The solubility is typically expressed in grams of solute per 100 grams of solvent. In order to answer the question of which solubility curve on the right best represents the data table on the left, we need to compare the solubility values in the data table with the solubility values on each of the curves.

We can see from the data table that the solubility of the substance increases with temperature, which is a common trend for most substances. As the temperature increases, the solvent molecules move faster, which allows more solute molecules to dissolve.

To compare the data table with the solubility curves, we need to look for the curve that shows an increase in solubility with increasing temperature. We can see that Curve A fits this description. The solubility values on Curve A increase as the temperature increases, just like the data table.

Therefore, we can conclude that Curve A best represents the data table on the left.

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If 10.0 moles of NaOH are dissolved in water to make 250.0 l of solution, the molarity of the solution is 0.04 moles

Molarity is defined as the number of moles of solute present in 1 litre of a solution. It is denoted by M and the formula is represented as

Molarity = number of moles of solute/ volume of the solution in L

According to given data

Number of moles of solute = 10 moles

volume of the solution = 250 L

Therefore, molarity = 10 moles/250 L

molarity = 0.04 moles.

Thus, molarity of the solution is 0.04 moles.

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