solvent = H2O
HNO3=solvat
C=md/ms*100 => md=C*ms/100=41,17*306/100=125,98g
ms=md+mH2O=>mH2O=ms-md=306-125,98=180g
MHNO3=63g/mol
n=m/M=125,98/63=2 moli HNO3
1 mol HNO3.....................NA=6,023*10^23 molecule
2 moli HNO3......................x= Calculeaza !!!
MH2O=18g/mol
n=m/M=180/18=10 moli H2O
1 mol H2O....................6,023*10^23 molecule
10 moli H2O.................6,023*10^24 molecule
