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What volume at STP is occupied by 2.5 mole of CO2 gas? (Molar volume = 22.4 litre)
A9.0 litre
B22.4 litre
C44.8 litre
D56.0 litre
Answer & Solution
Correct answer: D. 56.0 litre
1. Volume at STP $= \text{number of moles} \times \text{molar volume}$.
2. $= 2.5 \times 22.4$.
3. $= 56$ litre.
Dividing 22.4 by 2.5 wrongly gives 9.0; using 2 moles gives 44.8 litre.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 7 Atoms and Molecules "Solved Problems", p.108_
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