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  4. Volume of CO2 obtained from complete decomposition of 20 g CaCO3 at STP is:

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Q. Volume of $CO_{2}$ obtained from complete decomposition of $20 \,g$ $CaCO_{3}$ at STP is:

JIPMERJIPMER 2004

Solution:

$\underset{\overset{(40 +12 +3 \times 16)}{=100}}{CaCO _{3}} \ce{->[\Delta]} CaO +\underset{22.4\, litre}{ CO _{2}}$
$\because 100\, g\, CaCO _{3}$, on decomposition, gives
$=22.4$ litre $CO _{2}$ at STP
$\therefore 20\, g\, CaC 0_{3}$, on decomposition, will give
$=\frac{22.4 \times 20}{100}$
$=4.48$ litre $CO _{2}$ at STP