How many moles of water molecules are there in 50 g
of hydrated calcium nitrate, Ca(NO3), 2H,0?
(M: Ca(NO3)2.2H2O 200)
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Explanation:
The molecular weight of water H
2
O=2(1)+16=18g/mol.
The molecular weight of copper sulphate pentahydrate CuSO
4
.5H
2
O=64+32+4(16)+5(18)=250g/mol.
The percentage of water of crystallization in CuSO
4
.5H
2
O=
250
5×18
×100=36%.
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