Дано:                            РЕШЕНИЕ:

Vm=22.4 л.моль          CaC2 +2H2O--C2H2+Ca(OH)2

m(CaC2)=68г              m(CaC2)=54,4г

W(прим)=20%             n=54,4:64=0,85моль

V(C2H2)-?                   n(C2H2)=0,85

                                  V(C2H2)=n * Vm=0,85 * 22,4=19,04л