7.The % of water in Na2CO3. 7 H2O [s _______% [ At. Wt of Na-23, C=12, O-16, H-1 ]
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Formula unit mass of Na 2 CO3
= 2×atomic mass of Na+1×atomic mass of C+3×atomic mass of O
=2×22.98+1×12.01+3×16
=105.97u
Formula unit mass of 10H
2
O=10×atomic mass of H
2
O
=10×18.02
=180.02u
Formula unit mass of Na
2
CO
3
.10H
2
O=105.97+180.02
=285.99u
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