Question

how many grams of oxygen are required to react completely with 5.56 moles of hydrogen to form water?

2H2 + O2. 2H2O
2H2 + O2 ==> 2H2O
5.56 mols H2 will require 1/2 that or 5.56/2 = 2.78 mols O2.
grams O2 = mols O2 x molar mass O2 = ?
88.96g

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