Potassium oxide, amount of substance = 2.5 mol, was placed in a solution of hydrochloric acid. Calculate the mass of the salt in the solution.
Let’s compose the reaction equation, find the quantitative ratios of substances.
К2О + 2HCl = 2KCl + H2O.
According to the reaction equation, there is 2 mol of KCl for 1 mol of K2O. The substances are in quantitative ratios of 1: 2.
2n (K2O) = n (KCl) = 2.5 × 2 = 5 mol.
Let’s find the mass of KCl.
m = n × M,
M (KCl) = 74.5 g / mol.
m = 5 mol × 74.5 g / mol = 372.5 g.
Answer: 372.5 g.
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