Question

Calculate the formula mass of the hydrate,
CuSO4 • 5H2O Show your work.

Answer 1

Help PLEASE!

Answer 2

You mean molar mass?

Answer 3

Cu = 63.55 g/mol
S = 32.07 g/mol
O x 4 = 16.00 g/mol x 4 = 64.00 g/mol
H2O x 5 = 18.02 g/mol x 5 = 90.10 g/mol

Now add them all together and you get a molar mass of 249.72 g/mol

Of that 249.72 grams, 90.10 grams is water, so to find the percentage by mass that is water, simply divide 90.10 g by 249.72 g and multiply the result by 100%:

90.10 g / 249.72 g x 100% = 36.08% water