How many moles of water molecules are found in 3.80 moles of zinc (ii) sulfate heptahydrate?

Zinc (ii) sulfate heptahydrate has a formula of ZnSO4.7H2O

Therefore, note that one mole of ZnSO4.7H2O, contains 7 moles of H2O,

Hence, 3.8 moles of ZnSO4.7H2O will contain;

3.8 * 7/1

= 26.6 moles of H2O