дано
m(HCL) = 15 g
------------------------
m(KOH)-?
KOH+HCL-->KCL+H2O
M(HCL) = 36.5 g/mol
n(HCL) = m/M = 15 / 36.5 = 0.41 mol
n(KOH) = n(HCL) = 0.41 mol
M(KOH) = 56 g/mol
m(KOH) = n*M = 0.41*56 = 22.96 g
ответ 22.96 г
Вещество, раствор, раствора
C2H4+Cl2-->C2H4Cl2 (A)
CH2Cl-CH2Cl+2NaOH(H2O)-->CH2OH-CН2ОН (В) +2NaCl