Corban E. answered 02/02/21
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O2+2H2→2H2O
(16gO2/1)*(1molO2/32gO2)*(2molH2O/1molO2)*(18.02gH2O/1molH2O)=18.02 g H2O
(given)*(1/molar mass)*(coefficients)*(molar mass)=