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Given the balanced equation representing a reaction: 4nh3 + 5o2 4no + 6h2o what is the minimum number of moles of o2 that are needed to completely react with 16 moles of nh3?

1 Answer

6 votes

Key Concepts

  • Mole ratios
  • Limiting reagent
  • Balancing chemical equations

Solution


4NH_3 + 5O_2 \rightarrow 4NO + 6H_2O

We're given:


  • n(NH_3)=16\hspace{4}mol

  • n(O_2)=?

The mole ratio between NH3 and O2 is 4:5, meaning...


(n(NH_3))/(4)=(n(O_2))/(5)

Plug in the given moles of NH3 and solve for moles of O2:


(16)/(4)=(n(O_2))/(5)


n(O_2)=20

Answer

20 moles of O2 are needed to completely react with 16 moles of NH3.

User Jon Dosmann
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