Consider the reaction below.

2h2 + o2 > 2h2o

how many moles of water are produced from 13.35 mol of oxygen?
6.675 mol
26.70 mol
53.40 mol
66.75 mol

The moles  of water  that are produced  from 13.35  mol of oxygen  is 26.70  moles (answer B)

calculation

2H2 +O2→ 2H2O

The moles of H2O is  calculated using mole ratio.

that is; from the balanced  equation above  the mole ratio of O2 :H2O  is 1:2

therefore  the moles of water=13.35 moles x 2/1 =26.70 moles

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if you mean hydrogen and oxygen then water is the product