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Question

What will be the volume of CO2 at NTP obtained on heating 10 grams of (90% pure) limestone?

A
22.4 litres
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B
20.16 litres
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C
2.24 litres
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D
2.016 litres
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Solution

The correct option is D 2.016 litres
The given decomposition reaction is,
CaCO3CaO+CO2

Mass of CaCO3 taken is=10100×90=9 g

Again, 9 g CaCO3=9100 mol CaCO3=0.09 mol CaCO3

So CO2 produced=0.09×22.4 L=2.016 L

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