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H2+O2-->H2O

Balancing the equation:

2H2+O2-->2H2O

Mole relationship:

2 mole H2/2 mol H2O

1 mole O2/2 mol H2O

H2 has a molar mass of 2.02g and O2 has a molar mass of 32 so therefore the limiting reactant is H2 and the excess Reactant is O2

Balancing the equation:

2H2+O2-->2H2O

Mole relationship:

2 mole H2/2 mol H2O

1 mole O2/2 mol H2O

H2 has a molar mass of 2.02g and O2 has a molar mass of 32 so therefore the limiting reactant is H2 and the excess Reactant is O2