M(H2O) = 1*2 + 16=18
W(O) = Ar(O) * n / M(H2O) *100% = 16 *1 / 18 *100% = 89%
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M(H2O) = 1*2 + 16=18
W(O) = Ar(O) * n / M(H2O) *100% = 16 *1 / 18 *100% = 89%