112 г                                           Х г   CaO        +        H2O       =       Ca(OH)2n = 1 моль                                  n = 1 мольMr = 56 г/моль                           Mr = 74 г/мольm = 56 г                                      m = 74 г112 г СаО    -   Х г Са(ОН)256 г СаО     -    74 г Са(ОН)2m(Ca(OH)2) = 112 * 74 / 56 = 148 г