200 g of an 11% solution of ammonia and 350 g of a 17% solution of the same salt were mixed. What is the mass fraction of ammonia in the resulting solution?
ω = m (substance) / m (solution)
Find the mass of the substance m = 200 * 0.11 + 350 * 0.17 = 81.5 g
Find the mass of the solution m = m (initial) + m (added) = 200 + 350 = 550 g
ω (final) = 81.5 * 100/550 = 14.8%
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