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0,90=n(H2O)/[(nHNO3)+n(H2O)]
n(H2O)=9; (nHNO3)+n(H2O)=10
(nHNO3)=10-n(H2O)=10-9=1
ms(HNO3)=1*63=63g
ms(H2O)=9*18=162g
Cp=[ms(HNO3)*100%]/[ms(HNO3)+ms(H2O)]=(63*100)/(63+162)=28%