дано
m(ppa HCL) =20 g
W(HCL) = 2%
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V(H2O)-?
m(HCL) = 20 * 2% / 100% = 0.4 g
HCL+KOH-->KCL+HOH
M(HCL) = 36.5 g/mol
n(HCL) =m/M = 0.4 / 36.5 = 0.01 mol
n(HCL) = n(HOH) = 0.01 mol
V(HOH) = n(HOH) * Vm = 0.01 * 22.4 = 0.224 L
ответ 0.224 л