How many grams of water (H2O) are produced from 34 grams of oxygen (O2)? *

Explanation:

complete combustion reaction of  ethane is given by the reaction

2C2H6+7O24CO2+6H2O

no of moles in 34 grams of O2=34/32=1.063

7mole of O2 produced 6 moles of H2O

therefore 1.063 moles of O2 produced=1.063*6/7=0.9 moles

now 0.9 moles of H2O contain how much grams=0.9*18=16.2 grams

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