How many moles of oxygen gas react to yield 0.200 mole water? . c5h12(g) + 8 o2(g) = 5 co2(g) + 6h2o(g)

C5H12(g) + 8 O2(g) = 5 CO2(g) + 6H2O(g) 
molar ratio of H2O to O = 6:8 
we have 0.200 moles of H2O so we need 0.200 * 8/6 moles of O2 = 0.267 moles of O2 

Therefore, there will be 0.267 moles of O2 gas required to yield 0.2 moles of H20.

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The teacher is mostly talking about the distillation of a mixture