Calculate the percent by mass of the solute in each of the following aqueous solutions: (a) 5.50 g of nabr in 78.2 g of solution, (b) 31.0 g of kcl in 152 g of water, (c) 4.5 g of toluene in 29 g of benzene.

For a: The mass percent of NaBr is 7.03 %

For b: The mass percent of KCl is 16.94 %

For c: The mass percent of toluene is 13.43 %

Explanation:

To calculate the mass percentage of solute in solution, we use the equation:

        .......(1)

We are given:

Mass of NaBr (Solute) = 5.50 g

Mass of solution = 78.2 g

Putting values in equation 1, we get:

Hence, the mass percent of NaBr is 7.03 %

We are given:

Mass of KCl (Solute) = 31.0 g

Mass of water (solvent) = 152 g

Mass of solution = (31.0 + 152) g = 183 g

Putting values in equation 1, we get:

Hence, the mass percent of KCl is 16.94 %

We are given:

Mass of toluene (Solute) = 4.5 g

Mass of benzene (solvent) = 29 g

Mass of solution = (4.5 + 29) g = 33.5 g

Putting values in equation 1, we get:

Hence, the mass percent of toluene is 13.43 %

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