# 30 g of potassium chloride was dissolved in 400 g of water. Determine the mass fraction of potassium chloride in the solution.

March 29, 2021 | education

| Given:

m (KCl) = 30 g

m (H2O) = 400 g

To find:

ω (KCl) -?

Decision:

1) It is necessary to calculate the mass of the resulting potassium chloride solution:

m solution (KCl) = m (KCl) + m (H2O) = 30 + 400 = 430 g;

2) The mass fraction of potassium chloride in the resulting solution should be calculated:

ω (KCl) = m (KCl) * 100% / m solution (KCl) = 30 * 100% / 430 = 6.98%.

Answer: The mass fraction of KCl is 6.98%.

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