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Дано

m(O2) = 13.5 г

m(H2) = 1.7 г

Решение

m = m(O2) + m(H2) = 13.5 + 1.7 = 15.2 г

w(H) = m(H2) / m = 1.7 / 15.2 = 0.11 = 11%

w(O) = m(O2) / m = 13.5 / 15.2 = 0.89 = 89%

Ответ:

w(H) = 11%

w(O) = 89%