PERCENTAGE BY MASS
percent by mass expresses the concentration of a solution in terms of the mass of solute
in grams to the mass of the solution. For example, a salt solution of 10% concentration means that for every 100 grams of the solution it contains 10 grams of salt and 90 grams of water.
Percent by mass can be computed using the equation:
eta 0 masx= mus of toLute mus of xoluttion *100\%
Directions; Study the given problems and solve what is being asked for 1. A solution contains 5 grams of salt and 195 grams of water.
A. How many grams of solution are present?
B. What is the percent by mass concentration of the solution?
2. A sugar solution has a mass of 500 grams. The solution contains 200 grams of sugar.
A. How many grams of water is used in the solution?
B. What is the percent by mass concentration of the solution?
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Explanation:
Amount of Solute
% Solution X 100
Amount Solution
(Mass is expressed in grams, Volume is expressed in mL)
Fill in the known values (double check the units!!):
X g NaCl
13.5% Solution X 100 625 mL solution
Rearrange the equation to solve for the unknown value:
13.5 g
X 625 mL solution = X g NaCl
100 mL
Do the math:
84.375 g = X g NaCl
Round to the correct number of significant figures (3 in this case):
= 84.4 g NaCl would be needed
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