The thermal decomposition of 1.6608 grams of MgSO4 x H20 produces 1.4446 grams of a product in a well behaved reaction. There are two possibilites:
MgSO4 x H2O (s) -----> MgSO4 (s) + H20 (g)
MgSO4 x H2O (s) -----> MgO (s) + SO3 (g) + H20 (g)
Substance-----Formula Weight-----Moles-----Mass(g)
MgSO4 x H20
MgSO4
MgO