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

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Answer 1 · 2015-11-20T09:07:14

The percent by mass of potassium nitrate is 33%.

#"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.

#"mass of potassium nitrate"="75 g"#

#"mass of solvent (water)"="150 g"#

#"mass of solution"="75 g + 150 g"="225 g"#

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

#"Percent by mass"=(75cancel"g")/(225cancel"g")xx100="33 %"#