What is the mass percent of a solution containing 20 g of NaCl in 180 g of water

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Question: What is the mass percent of a solution containing 20 g of NaCl in 180 g of water?

Options:

Correct Answer: 10%

Solution:

Mass percent = (mass of solute / total mass) x 100 = (20 g / (20 g + 180 g)) x 100 = 10%.

What is the mass percent of a solution containing 20 g of NaCl in 180 g of water?

What is the mass percent of a solution containing 20 g of NaCl in 180 g of water?

Correct Answer: 10%

Step 1: Identify the mass of the solute (NaCl), which is 20 g.
Step 2: Identify the mass of the solvent (water), which is 180 g.
Step 3: Calculate the total mass of the solution by adding the mass of the solute and the mass of the solvent: 20 g + 180 g = 200 g.
Step 4: Use the mass percent formula: Mass percent = (mass of solute / total mass) x 100.
Step 5: Substitute the values into the formula: Mass percent = (20 g / 200 g) x 100.
Step 6: Calculate the fraction: 20 g / 200 g = 0.1.
Step 7: Multiply by 100 to get the mass percent: 0.1 x 100 = 10%.

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