I am figuring out how many moles of CU2SO4 are in 485.6 grams. How would you set up the proportion for this? What would the answer then be. Thanks. I really need an example to jumpstart this worksheet.

Question

I am figuring out how many moles of CU2SO4 are in 485.6 grams.  How would you set up the proportion for this? What would the answer then be.  Thanks.  I really need an example to jumpstart this worksheet.

bobpursley · Answer

You have to figure the formula mass for this. Get your periodic table out, and look up the atomic mass of Cu, S, and O

Now take two Cu, one S, and 4 O and add them. That is the mass of one mole of Cu2SO4.

Divide that into 485.6 that is how many moles of Cu2SO4 are in that mass.

Are you certain of the form of Cu2SO4? Normally, it is in hydrated form, with a formula such as..

Cu2SO4.5H20

If you are in the lab, you are probably using a hydrated form. If this is just a calculation exercise, ignore this part of reality.

Damon · Answer

2Cu = 127 g 1S = 32 g 4O = 64 g so 223 grams per mole 485.6 grams (1 mole/223 g) = 2.18 moles

Meghan · Answer

Thank you so much. That was really easy to understand.