M(NaOH) = 23+16+1=40г/моль
n(NaOH) = m/M = 4/40 = 0.1моль
C = n/V = 0.1 / 2 = 0.05 моль/л
Ответ: B
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M(NaOH) = 23+16+1=40г/моль
n(NaOH) = m/M = 4/40 = 0.1моль
C = n/V = 0.1 / 2 = 0.05 моль/л
Ответ: B