If 27 g of Carbon is mixed with 88 g of Oxygen and is allow…

Chemistry Some Basic Concepts of Chemistry The Mole Concept Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

If 27 g of Carbon is mixed with 88 g of Oxygen and is allowed to burn to produce CO 2 , then :

Oxygen is the limiting reagent.

Volume of CO 2 gas produced at NTP is 50.4 L.

C and O combine in mass ratio 3 : 8.

Volume of unreacted O 2 at STP is 11.2 L.

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(b,c,d)

C + O 2 CO 2

mass 27 88

moles

C is limiting reagent

Moles of CO 2 produced = moles of C = = 2.25

∴ Volume of CO 2 at STP = 2.25 × 22.4 = 50.4 L

Ratio of C and O in CO 2 = 12 : 32 = 3 : 8

Moles of unreacted O 2 = 2.75 – 2.25 = 0.5

∴ Volume of unreacted O 2 at STP = 0.5 × 22.4 = 11.2 L

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