1,5 моль                                                                Х г
СaC2        +        2H2O       =      Ca(OH)2      +    C2H2

n = 1 моль                                                             n = 1 моль

                                                                             Mr = 26 г/моль

                                                                              m = 26 г

1,5 моль СаС2      -      Х г С2Н2

1 моль СаС2        -     26 г С2Н2

m(C2H2) = 1,5 * 26 / 1 = 39 г