Question

Volume of $C{{O}_{2}}$ obtained from complete decomposition of $20\,\,g\,\,CaC{{O}_{3}}$ at STP is:

• A. $2.24\,\,litre$
• B. $4.48\,\,litre$
• C. $20\,\,litre$
• D. $22.4\,\,litre$

Answer 1

Answer: (B)

$4.48\,\,litre$

Answer 2

$\underset{\overset{(40+12+3\times 16)}{=100}}{CaCO_3} {->[\Delta]} CaO + \underset{22.4\,litre}{CO_2}$ $\because 100 \,g\, CaCO _{3}$, on decomposition, gives $=22.4$ litre $CO _{2}$ at STP $\therefore 20 \,g \,CaCO _{3}$, on decomposition, will give $= \frac{22.4 \times 20}{100}$ $= 4.48 \,$ litre $\,CO_2$ at $STP$