Question

Câte grame de hidrogen se vor degaja in urma reactiei dintre zinc si acid sulfuric,daca se consuma 10 g soluție de acid sulfuric cu c=20%?

Answer 1

C=md/ms*100 => md=C*ms/100=20*10/100=2g H2SO4

Zn + H2SO4 -> ZnSO4 + H2

MH2SO4=2AH+AS+4AO=2*1+32+4*16=98g/mol

MH2=2AH=2*1=2g/mol

98g H2SO4...............................2g H2
2g H2SO4.................................xg

x=2*2/98 = Calculeaza !!