A sample of ammonia reacts with oxygen as shown. 4 NH sub 3 g plus 5 cap o sub 2 g rightarrow 4 NO g plus 6 cap h sub 2 cap o g What is the limiting reactant if 4 point 0 g of NH sub 3 react with 8 point 0 g of oxygen?

Convert each mass to moles: 4.0 g NH₃ is about 0.24 mol, and 8.0 g O₂ is 0.25 mol. The balanced equation requires 5 mol O₂ for every 4 mol NH₃, so 0.24 mol NH₃ would need about 0.30 mol O₂; there is not enough oxygen. Oxygen is therefore the limiting reactant, and it can produce 0.25 × 4/5 = 0.20 mol NO, matching choice D.

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