w = m(вещества) / m (раствора) * 100%
m(вещества) = w * m (раствора) / 100%
m(Na) = w * m (NaOH) / 100% = 18*550 / 100 = 99 г
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w = m(вещества) / m (раствора) * 100%
m(вещества) = w * m (раствора) / 100%
m(Na) = w * m (NaOH) / 100% = 18*550 / 100 = 99 г