1. C=md/ms*100 => md=C*ms/100=20*10/100 = 2g H2SO4
Zn + H2SO4 -> ZnSO4 + H2
98g H2SO4.......................2g H2
2g H2SO4.........................xg H2
x=2*2/98 = Calculeaza !!
2. MH2O = 2AH+AO = 2*1+16=18g/mol
%H=mH/MH2O*100 = 2/18*100 = Calculeaza !!
%O = 16/18*100 = Calculeaza !!