Determine the mass of a 6% sodium chloride solution containing 9 g of salt.

Given:
m (NaCl) = 9 g
ω (NaCl) = 6%

To find:
m solution (NaCl) -?

Decision:
1) The initial formula for finding the mass fraction of a substance in a solution:
ω (NaCl) = m (NaCl) * 100% / m solution (NaCl);
2) Using the original formula, it is necessary to calculate the mass of the sodium chloride solution:
m solution (NaCl) = m (NaCl) * 100% / ω (NaCl) = 9 * 100% / 6% = 150 g.

Answer: The mass of sodium chloride solution is 150 g.