4Mg+5H2SO4=4 MgSO4+ H2S+4H2O
4 5
n(Mg)=12 :24=0,5; n(H2SO4)=0,5*5/4=0,625;
m(H2SO4)в р-ре=0,625*98=61,25г; m(H2SO4)р-ра =61,25 : 0,92=66,6г; V(H2SO4)=66,6/1,83=36,38мл.
4Mg+5H2SO4=4 MgSO4+ H2S+4H2O
4 5
n(Mg)=12 :24=0,5; n(H2SO4)=0,5*5/4=0,625;
m(H2SO4)в р-ре=0,625*98=61,25г; m(H2SO4)р-ра =61,25 : 0,92=66,6г; V(H2SO4)=66,6/1,83=36,38мл.