Answer to Question #109106 in General Chemistry for Amy

Question

A solution contains 7.1 parts per million oxygen. There are 0.027 grams of oxygen dissolved in the solution. How much of the solvent water in grams are in the solution

Answer 1

The number or moles of oxygen O2 is 0.027 g / 32 g/mole = 8.44*10^-4 mole

The number of moles of water is that of oxygen divided by concentration:

8.44*10^-4 / 7.1*10^-6 = 118.87 mole

the mass of water H2O is 118.87 mole * 18 g/mole = 3400 g