Mr(CuO) = 64+16 = 80
m(CuO) = ν*Mr = 0,2*80 = 16 гр.
400-----х
62------22,4л
х=400*22,4/62=144,5л
144,5----------100%
х----------------30%
х=30*144,5/100=43,35
Zn+H2SO4=ZnSO4+H2
Fe3O4+4H2=3Fe+4H2O
n(Fe3O4)=m/M=11,6/232=0.05 моль
4n(Fe3O4)=n(H2)
n(H2)=0.05*4=0.2 моль
n(H2)=n(H2SO4)
m(H2SO4)=n*M=0.2*98=19.6 г
V(H2SO4)=m*100%/15% хр=19.6 х
100/15*1.1=118.78 мл