Weight of pure limestone \(\left( CaCO _3\right)=20 \%\) of \(20\,g\)
\(=\frac{20}{100} \times 20\)
\(=4\,g\)
\(n _{ CaCO _3}=\frac{4}{100}=0.04\)
\(CaCO _3 \rightarrow CaO + CO _2\)
\(n =0.04 \quad n =0.04\)
\(n _{ CO _2}=0.04\)
\(W _{ CO _2}=0.04 \times 44\)
\(=1.76\,g\)