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Mass percent is the ratio of the mass of solute to the total mass of solution expressed as a percent

Here we have 4.0 g solute and total mass of solution of 4.0 g + 50.0 g = 54.0 g. So, the mass percent of KCl = 4.0 g/54.0g (x100) = 7.41% (3 sig figs)

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Q: What is the mass percent of a solution that is prepared by dissolving 4.0 g of KCl in 50.0 g of H2O?
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