1. Masa molara H2SO4 = H*2+S+O*4=2+32+64=98 g/mol
98 g H2SO4 ..... 32 g S
9,8 g H2SO4 ..... x g S
x = 32*9,8:98=313,6:98=3,2 => 3,2 g de S se afla in 9,8 g H2SO4
2. Masa molara H2O = H*2+O=2+16=18 g/mol
18 g H2O ..... 16 g O
36 g H2O ..... x g O
x = 16*36:18= 32 g => in 36 g H2O se afla 32 g O
