A solution contains 51 ppm of benzene. The density of the solution is 1.00 g/mL. This means that ________.
A)there are 51 mg of benzene in 1.0 L of this solution
B)100 g of the solution contains 51 g of benzene
C)100 g of the solution contains 51 mg of benzene
D)the solution is 51% by mass of benzene
E)the molarity of the solution is 51 M

Question

Quizplus · Accepted Answer

PPM stands for parts per million, which means that there are 51 parts of benzene for every million parts of the solution. Since the density of the solution is 1.00 g/mL, this means that there are 1,000 mL in 1.00 L. Therefore, in 1.0 L of this solution, there are (51 ppm) x (1.0 L) x (1.00 g/mL) x (1 mg/1000 μg) = 51 mg of benzene.

A Solution Contains 51 Ppm of Benzene