KVPY SA Exam 05-Nov-2017 Question Paper

Question : 42 of 80

Marks: +1, -0

In a closed vessel at STP, 50 L of CH

_4

is ignited with 750 L of air (containing 20% O

_2

). The number of moles of O

_2

remaining in the vessel on cooling to room temperature is closest to

Solution:

{CH_4}↙{50\ L } +{2O_2}↙{150\ L }\ –––––▸CO_2 +2H_2O

_4

is limiting reagent
Moles of O

_2

remaining =

50/22.4=2.2

moles

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