Question

Calculate the mass fraction of sodium chloride in the solution if 20 g of it is dissolved in 300 ml of water.

Answer 1

The mass fraction of sodium chloride is 0.0625

What is the mass fraction of sodium chloride in the solution?

The mass fraction of sodium chloride is the ratio of the mass of sodium chloride to the total mass of the solution.

The mass fraction of sodium chloride is determined as follows;

mass of sodium chloride = 20 g

• mass of water = volume * density

density of water = 1 g/mL

volume of water = 300 mL

mass of water = 300 mL * 1 g/mL

mass of water = 300 g

total mass of solution = 20 + 300 = 320 g

mass fraction of sodium chloride = 20/320

mass fraction of sodium chloride = 0.0625

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