Х г                                                                      224 г

  2NaCl      +        H2SO4     =     Na2SO4      +    2HCl

n = 2 моль                                                            n = 2 моль

Mr = 58,5 г/моль                                                  Mr = 36 г/моль

m = 117 г                                                              m = 72 г

Х г NaCl     -    224 г HCl

117 г NaCl   -   72 г HCl

m(NaCl) = 117 * 224 / 72 = 364 г