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CaIculate the percent by mass and the molality
问题详情
CaIculate the percent by mass and the molality in terms of CuSO4 for a solution prepared by dissolving 11.5g of CuSO4·5H2O in 0.1000kg of water. Remember to consider the water released from the hydrate.
参考答案
Solution: m(CuSO4)=[-11.5×159.6/249.68]g=7.35g
m(H2O)=[11.5-7.35]g=4.15g
Percent by mass: 7.35/(100.0+4.15)=0.071
b=[-7.35/(159.6×0.1042)]mol·kg-1=0.442mol·kg-1
