What is the concentration of a solution if 10 grams of NaCl is dissolved in 500

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Question: What is the concentration of a solution if 10 grams of NaCl is dissolved in 500 mL of water? (Molar mass of NaCl = 58.5 g/mol)

Options:

Correct Answer: 0.34 M

Solution:

Molarity (M) = moles of solute / liters of solution = (10 g / 58.5 g/mol) / 0.5 L = 0.34 M.

What is the concentration of a solution if 10 grams of NaCl is dissolved in 500 mL of water? (Molar mass of NaCl = 58.5 g/mol)

What is the concentration of a solution if 10 grams of NaCl is dissolved in 500 mL of water? (Molar mass of NaCl = 58.5 g/mol)

Correct Answer: 0.34 M

Step 1: Find the molar mass of NaCl, which is given as 58.5 g/mol.
Step 2: Calculate the number of moles of NaCl by using the formula: moles = mass (g) / molar mass (g/mol). Here, mass is 10 grams.
Step 3: Substitute the values: moles = 10 g / 58.5 g/mol.
Step 4: Perform the calculation: moles = 0.171 moles (approximately).
Step 5: Convert the volume of the solution from mL to L. Since 500 mL = 0.5 L.
Step 6: Use the molarity formula: Molarity (M) = moles of solute / liters of solution.
Step 7: Substitute the values: M = 0.171 moles / 0.5 L.
Step 8: Perform the calculation: M = 0.342 M (approximately).

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