Upon evaporation of 300 g of a 5% sucrose solution, 245 g of a solution are obtained. What is the mass fraction of sucrose in it?

ω = m (substance) / m (solution)
Find the mass of sucrose m = 300 * 0.05 = 15 g
ω = m (substance) / m (solution) = 15 * 100/245 = 6%

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