Дддддооооопппооожжжіііітттьььь

Question

Дддддооооопппооожжжіііітттьььь

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Answer 1

   14,4 г                                                                         Х г

   3Mg         +      2H3PO4     =    Mg3(PO4)2        +   3H2

n = 3 моль                                                               n = 3 моль

Mr = 24 г/моль                                                        Mr = 2 г/моль

m = 72 г                                                                   m = 6 г

14,4 г Mg     -     Х г Н2

72 г Mg      -     6 г Н2

m(H2) = 14,4 * 6 / 72 = 1,2 г

2)  K2O + 2HNO3 = 2KNO3 + H2O

Zn + 2HCl = ZnCl2 + H2