# 30 g of common salt was dissolved in 170 g of water. Find the mass fraction (in%) of the salt in the resulting solution.

May 30, 2021 | education

| Given:

m (NaCl) = 30 g

m (H2O) = 170 g

To find:

ω (NaCl) -?

Decision:

1) Calculate the mass of the resulting solution:

m solution (NaCl) = m (NaCl) + m (H2O) = 30 + 170 = 200 g;

2) Calculate the mass fraction of NaCl in the resulting solution:

ω (NaCl) = m (NaCl) * 100% / m solution (NaCl) = 30 * 100% / 200 = 15%.

Answer: The mass fraction of NaCl is 15%.

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