SAMPLE PROBLEM 13.5
Converting concentration units
PLAN:
SOLUTION:
(a) molality
(b) mole fraction
(c) molarity
(a) To find the mass of solvent, assume the % is per 100 g of solution. Take the difference in the mass of the solute and solution to determine the mass of solvent.
(b) Convert g of solute and solvent to moles before finding c.
(c) Use the density to find the volume of the solution.
(a)
g of H2O = 100. g solution - 30.0 g H2O2 =
70.0 g H2O
molality =
30.0 g H2O2
34.02 g H2O2
mol H2O2
70.0 g H2O
kg H2O
103 g
= 12.6 m H2O2
x
x
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