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Mass Percent Formula

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Next SectionBalancing Chemical Equations

Solution: Calculate the percent by mass of potassium nitrate in a solution made from 45.0g KNO₃ and 295 mL of water. Density of water is 0.997 g/mL.A. 15.2% B. 13.3% C. none of them D. 1.51% E. 7.57%

Solution: Calculate the percent by mass of potassium nitrate in a solution made from 45.0g KNO3 and 295 mL of water. Density of water is 0.997 g/mL.A. 15.2%B. 13.3%C. none of themD. 1.51%E. 7.57%

Problem

Calculate the percent by mass of potassium nitrate in a solution made from 45.0g KNO₃ and 295 mL of water. Density of water is 0.997 g/mL.

A. 15.2%
B. 13.3%
C. none of them
D. 1.51%
E. 7.57%

Solution

We are asked to calculate for the percent by mass (mass %) of potassium nitrate in solution and to do that we’re going to use the mass percent formula shown below:

Since we are dealing with a solution, we can rewrite the equation as:

We don’t have the mass of the solution but we can calculate it using the mass of the solute and the mass of solvent.

▪ solute → KNO₃
▪ solvent → where KNO₃ is dissolved → Water (H₂O)

The equation now becomes:

View Complete Written Solution

Mass Percent Formula

Solution: Calculate the percent by mass of potassium nitrate in a solution made from 45.0g KNO3 and 295 mL of water. Density of water is 0.997 g/mL.A. 15.2% B. 13.3% C. none of them D. 1.51% E. 7.57%

Solution: Calculate the percent by mass of potassium nitrate in a solution made from 45.0g KNO3 and 295 mL of water. Density of water is 0.997 g/mL.A. 15.2%B. 13.3%C. none of themD. 1.51%E. 7.57%

Practice Problems

Solution: Calculate the percent by mass of potassium nitrate in a solution made from 45.0g KNO₃ and 295 mL of water. Density of water is 0.997 g/mL.A. 15.2% B. 13.3% C. none of them D. 1.51% E. 7.57%