-calculez masa de acid din solutie
c/100=md/ms
10/100=md/200------> m,HCl= 20g;
MHCl= 36,5g/mol, Vm=22,4l/mol
-calculez vol.de gaz degajat
2mol........................1mol
Zn + 2HCl----> ZnCl2 + H2
2x36,5g....................22,4l
20g.................................x...........................calculeaza !!!!!