Chemistry problems?

Question

I am horrible at math and my job is getting me behind in my chemistry. can in one help with the following questions.

1.Calculate the volume of 2.50 moles of zinc, assuming the density of the metal to be 7.14 g/cc.

2.Calculate the volume of 1.25 moles of magnesium, assuming the density of the metal to be 1.74 g/cc.

Answer 1

Zinc weighs 65.38g/mol so:

65.38g/mol x 2.5mol x 0.140cc/g = 22.88cc

Note: you need to use the reciprocal of density for this calculation! Notice how the units all cancel except cc's.

For the second one, it is done the same way as above:

Mg is 24.30g/mol so:

24.30g/mol x 1.25mol x 0.575cc/g = 17.47cc