Solutions to Chem 321 Work Group Set 1 Questions
Review Topics
An aqueous solution contains 1.3 ppm benzene (C6H6). What is the mass
percent of benzene in this solution?
1.3 ppm C6H6 means there is 1.3 x 10-6 g C6H6 / g solution
mass % C6H6 is defined as
Therefore,
The density of a 70.5% by mass aqueous solution of perchloric acid is 1.67 g/mL.
How many milliliters of this solution are needed to make 0.250 L of a 1.00 M
solution of perchloric acid?
First calculate the molarity of the perchloric acid solution.
molarity = mol solute / L solution
one liter of concentrated perchloric acid solution weighs
one liter of concentrated perchloric acid solution contains
Therefore,
