Homework Help: chemistry

Posted by rose on Thursday, February 21, 2013 at 1:59pm.

if 125g of magnesium sulfate heptahydrate is completely dehydrated, how many grams of anhydrous salt will remain?

i would really appreciate anyone's help

chemistry - DrBob222, Thursday, February 21, 2013 at 2:50pm
MgSO4.7H2O ==> MgSO4 + 7H2O

mols MgSO4.7H2O = grams/molar mass = about 0.5 mol but that's approximate.
Therefore, you should obtain approximately 0.5 mol MgSO4.
g = mols x molar mas = ?
chemistry - rose, Thursday, February 21, 2013 at 3:51pm
thank you!!

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