Ответ:
дано
W(NaOH) = 20%
p(NaOH) = 1/22 g/mL
m(CH3CH2COOH) = 148 g
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V(рра NaOH) - ?
NaOH+CH3CH2COOH-->CH3CH2COONa+HOH
M(CH3CH2COOH) = 74 g/mol
n(CH3CH2COOH) = m/M = 148 / 74 = 2 mol
n(NaOH) = n(CH3CH2COOH) = 2 mol
M(NaOH) = 40 g/mol
m(NaOH) = n*M = 2 *40 = 80 g
m(ppaNaOH) = 80 * 100% / 20% = 400 g
V(ppa NaOH) = m(ppa NaOH) / p(NaOH) = 400 / 1.22 = 327.89 mL
ответ 327.89 мл
Объяснение: