If 30g of CuSO4 • 5H20 are present, how many moles of CuSo4 • 5H2O are present?

Question

I need help with this chemistry question please? Silly me didn't copy fast enough when my instructor was working on the problem on the board & was also focusing how he was solving it as well. I worked on the problem on my own, but I don't know if I got it right, so, I just want to make sure I got the right answer, or that I was aleast close to getting the correct answer. Thank-you! I truly appreacite anyone's help! :) I also need help with setting up the problem as well. 

Answer 1

I will show you how to solve it, and you can fill in the math.

 

You need to find the molecular weight in grams of CuSO₄ · 5(H₂O).  Recall that the molecular weight is the mass in grams of 1 mole of the substance.

 

(1)  Look up the atomic weights of Cu, S, O, and H.  Note each molecule has 1 Cu, 1 S, 9 O, and 10 H.

 

(2)  Add the atomic weights as follows:

 

1(Cu) + 1(S) + 9(O) + 10(H)

 

The result will be the molecular weight of CuSO₄ · 5(H₂O).

 

(3)  Divide the number of grams by the molecular weight, and that will be the number of moles.