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Dane:
Vr=30[cm3];
dr=1,418[g/cm3];
Cp=70%;
mr=Vr*dr=30*1,418=42,54[g];
ms=(Cp*mr)/100%=(70*42,54)/100=29,8[g]HNO3;
M HNO3=1[g/mol]+14[g/mol]+48[g/mol]=63[g/mol];
1 [mol]HNO3 - 63[g];
x[moli]HNO3 - 29,8[g];
x=0,47[mola]HNO3.