Question

calculate the relative molecular mass of CuSO4. 5H2O

Answer 1

molecular mass of copper is 63.54 grams mass of Sulphur is 32.6 grams in mass of oxygen is 16 grams here we do not include mass of water of crystallisation so that means we have to add mass of copper + mass of sulphur plus mass of oxygen x 4 = 63.54 + 32.6 + 64 = 160.14 g
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Answer 2

The molecular mass = 64+ 32+ 4×16 + 5 (1 × 2+16)
= 64+ 32 + 64 + 90
= 250 g