CaSO4•H2O->(t) CaSO4+H2O
m(CaSO4)=17g
m(CaSO4•xH2O)=21.5g
M(CaSO4•xH2O)=m(CaSO4•xH2O)*M(CaSO4)/m(CaSO4)=21.5*136/17=172g/mol
x=(M(CaSO4•xH2O)-M(CaSO4))/18=(172-136)/18=2
CaSO4•2H2O
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