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例1某温度下,100 g饱和硝酸钾溶液中含硝酸钾31.6 g,现向其中加入4.4 g硝酸钾晶体和5.6 g水,保持溶液温度不变.此时溶液中溶质的质量分数为( ).
Example 1 Under a certain temperature, 100 g saturated potassium nitrate solution contains 31.6 g of potassium nitrate, and 4.4 g of potassium nitrate crystal and 5.6 g of water are added to it to keep the solution temperature constant. The mass fraction of solute in the solution is () .