A 4.1045 g sample of a hydrate of NiSO4 was heated to drive off all of the water of hydration. The remaining
solid weighed 2.2616 g. If NiSO4·x H2O represents the formula of the hydrate, then what is the value of x ?
Note: The notation NiSO4·x H2O indicates that there are x moles of H2O for every mole of NiSO4 in the solid hydrate.
Molar masses (in g mol−1):
H, 1.008N, 14.01O, 16.00Mg, 24.31S, 32.07Mn, 54.94Ni, 58.69Cu, 63.55Hg, 200.6