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How many moles of NaCl should be dissolved in 100 mL of water to get 0.2 M solution?
- a)0.2
- b)0.02
- c)0.01
- d)0.1
Correct answer is option 'B'. Can you explain this answer?
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How many moles of NaCl should be dissolved in 100 mL of water to get 0...
Molarity = no of moles /volume( in litre) 0.2 =no of moles / 0.1 No of moles =0.2 × 0.1 = 0.02
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Moles and Molarity
Moles and Molarity are important concepts in chemistry. Moles represent a unit of measurement for the amount of a substance, while Molarity represents a unit of concentration.
Moles
Moles are a unit of measurement for the amount of a substance. One mole of a substance represents a fixed number of particles, which is known as Avogadro's number (6.022 x 10^23). The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.
Molarity
Molarity is a unit of concentration. It represents the number of moles of a solute dissolved in one liter of a solution. The formula for calculating Molarity is:
Molarity = moles of solute / volume of solution (in liters)
Answer
The question asks us to find the number of moles of NaCl that should be dissolved in 100 mL of water to get a 0.2 M solution. We can use the formula for Molarity to solve this problem.
Molarity = moles of solute / volume of solution (in liters)
We know that the volume of the solution is 100 mL, which is equal to 0.1 L. We also know that we want a 0.2 M solution. Therefore, we can rearrange the formula to solve for the number of moles of solute.
moles of solute = Molarity x volume of solution (in liters)
moles of solute = 0.2 x 0.1
moles of solute = 0.02
Therefore, we need to dissolve 0.02 moles of NaCl in 100 mL of water to get a 0.2 M solution.
The correct answer is option B (0.02).
Moles and Molarity are important concepts in chemistry. Moles represent a unit of measurement for the amount of a substance, while Molarity represents a unit of concentration.
Moles
Moles are a unit of measurement for the amount of a substance. One mole of a substance represents a fixed number of particles, which is known as Avogadro's number (6.022 x 10^23). The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.
Molarity
Molarity is a unit of concentration. It represents the number of moles of a solute dissolved in one liter of a solution. The formula for calculating Molarity is:
Molarity = moles of solute / volume of solution (in liters)
Answer
The question asks us to find the number of moles of NaCl that should be dissolved in 100 mL of water to get a 0.2 M solution. We can use the formula for Molarity to solve this problem.
Molarity = moles of solute / volume of solution (in liters)
We know that the volume of the solution is 100 mL, which is equal to 0.1 L. We also know that we want a 0.2 M solution. Therefore, we can rearrange the formula to solve for the number of moles of solute.
moles of solute = Molarity x volume of solution (in liters)
moles of solute = 0.2 x 0.1
moles of solute = 0.02
Therefore, we need to dissolve 0.02 moles of NaCl in 100 mL of water to get a 0.2 M solution.
The correct answer is option B (0.02).
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How many moles of NaCl should be dissolved in 100 mL of water to get 0.2 M solution?a)0.2b)0.02c)0.01d)0.1Correct answer is option 'B'. Can you explain this answer?
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