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What is the mass percent concentration of a solution containing 25.0 g of sodium chloride and 155.0 mL of water? Assume a density of 1.00 g/mL for water.

A. 13.9%
B. 2.76%
C. 6.20%
D. 16.1%

1 Answer

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The mass percent concentration of the solution is 13.9%. Option A

The total mass of the solution = mass of solute (sodium chloride) + mass of solvent (water)

Given:

Mass of sodium chloride (solute) = 25.0 g

Volume of water (solvent) = 155.0 mL

Density of water = 1.00 g/mL

First, convert the volume of water to its mass:

Mass of water = Volume of water × Density of water

Mass of water = 155.0 mL × 1.00 g/mL

Mass of water = 155.0 g

Total mass of the solution = Mass of sodium chloride + Mass of water

Total mass of the solution = 25.0 g + 155.0 g

Total mass of the solution = 180.0 g

Now, calculate the mass percent concentration of sodium chloride in the solution:

Mass percent concentration = (Mass of solute / Total mass of solution) × 100

Mass percent concentration = (25.0 g / 180.0 g) × 100

Mass percent concentration ≈ 13.9%

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