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:
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.
C. none of them
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Based on our data, we think this problem is relevant for Professor Olatunde's class at CITYTECH CUNY.