Дано
V(C2H6) = 23.8 л = 23.8 дм3
Решение
n(C2H6) = V(C2H6) / Vm = 23.8 / 22.4 = 1.0625 моль
C2H6 + Cl2 = C2H5Cl + HCl
n(C2H5Cl) = n(C2H6) = 1.0625 моль
m(C2H5Cl) = n(C2H5Cl)M(C2H5Cl) = 1.0625 * (2 * 12 + 5 * 1 + 35.5) = 1.0625 * 64.5 = 68.53125 г
Ответ: 68.53125 г