m(раствора) = m(NaOH) + m(H2O) = 20 + 60 = 80(г)
w(NaOH) = (m(NaOH)/m(раствора))*100% = (20/80)*100% = 25%
Ответ: w(NaOH) = 25%
m(раствора) = m(NaOH) + m(H2O) = 20 + 60 = 80(г)
w(NaOH) = (m(NaOH)/m(раствора))*100% = (20/80)*100% = 25%
Ответ: w(NaOH) = 25%