Question

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

i would really appreciate anyone's help

Answer 1

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 = ?

Answer 2

thank you!!