Calculez masa de acid ,apoi molii,din solutie
c/100= md/ms
3,65/100= md/500---> md= 3,65x5 g HCl
n= m/M; n= 3,65x5g/36,5g/mol=0,5mol HCl
2mol........................................1mol
2HCl + CaCO3---> CaCl2 + CO2 + H2O
0,5mol....................................x=0,25mol
V= n x V,m=> 0,25molx22,4l/mol= ..............calculeaza !!!