M(H2O2) = 1*2 +16*2= 34g/mol
M(H2O) = 1*2 +16 =18g/mol
in 34 g H2O2 .....2g de H
rezulta ca celelalte 4 g de H se afla in apa
18 g H2O ....2g H
iar 4 g H se vor gasi in 36g apa
masa amestecului = 34g +36g = 70g
ω(H2O2) = 34g /70 g*100%= 48,5%
ω(H2O)= 100%-48.5%= 51.5%