# 75g of potassium nitrate are dissolved in 150g of water. What is the percent by mass of potassium nitrate?

Nov 20, 2015

The percent by mass of potassium nitrate is 33%.

#### Explanation:

"Percent by mass"=("mass of solute")/("mass of solution")xx100

The solute is potassium nitrate.

The solvent is water.

The mass of the solution is the mass of the solute plus the mass of the solvent.

$\text{mass of potassium nitrate"="75 g}$

$\text{mass of solvent (water)"="150 g}$

$\text{mass of solution"="75 g + 150 g"="225 g}$

"Percent by mass"=("mass of solute")/("mass of solution")xx100

$\text{Percent by mass"=(75cancel"g")/(225cancel"g")xx100="33 %}$