Дано
m = 120 г
w(HCl) = 63% = 0.63
Решенине
m(HCl) = mw(HCl) = 120 * 0.63 = 75.6 г
n(HCl) = m(HCl) / M(HCl) = 75.6 / (1 + 35.5) = 76.5 / 36.5 = 2.07 моль
Zn + 2HCl = ZnCl2 + H2
n(ZnCl2) = 0.5n(HCl) = 0.5 * 2.07 = 1.035 моль
m(ZnCl2) = n(ZnCl2)M(ZnCl2) = 1.035 * (65 + 2 * 35.5) = 1.035 * 136 = 140.76 г
Ответ: 140.76 г