1.
Mr(Na2SO4) = 142
Mr(Na2SO4 · 10Н2О) = 322
W(Na2SO4) = (142 : 322) × 100% = 44,1%
W(10Н2О) = 100 - 44,1 = 55,9%
2.
Mr(Al(NO3)3) = 213
Mr(Al(NO3)3 · 9Н2О) = 375
W(Al(NO3)3) = (213 : 375) × 100% = 56,8%
W(9Н2О) = 100 - 56,8 = 43,2%
3.
Mr(ZnSO4) = 161
Mr(ZnSO4 · 7Н2О) = 287
W(ZnSO4) = (161 : 287) × 100% = 56,1%
W(7H2O) = 100 - 56,1 = 43,9%
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Answers & Comments
1.
Mr(Na2SO4) = 142
Mr(Na2SO4 · 10Н2О) = 322
W(Na2SO4) = (142 : 322) × 100% = 44,1%
W(10Н2О) = 100 - 44,1 = 55,9%
2.
Mr(Al(NO3)3) = 213
Mr(Al(NO3)3 · 9Н2О) = 375
W(Al(NO3)3) = (213 : 375) × 100% = 56,8%
W(9Н2О) = 100 - 56,8 = 43,2%
3.
Mr(ZnSO4) = 161
Mr(ZnSO4 · 7Н2О) = 287
W(ZnSO4) = (161 : 287) × 100% = 56,1%
W(7H2O) = 100 - 56,1 = 43,9%