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Limiting reagent amount estimation

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Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor:
4NH3 + 5O2 > 4NO + 6H2O
When 20.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent?

https://brainmass.com/chemistry/stoichiometry/limiting-reagent-amount-estimation-207860

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A limiting reagent is one which is present in the minimum amount in the reaction and is consumed completely during the reaction.
Now, moles of NH3 = 20.0 g/(17 g/mol)= 1.17moles
Moles of O2 = 50.0 g/(32 g/mol) = 1.56 moles

According to balanced equation,
ratio of NH3 : O2
4 : 5
While the present mole ratio: 1.17 : 1.56
or 3 4

Which means that NH3 is present in lower amount than required and hence is limiting reagent

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