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Q.
Calculate the amount of $CO_{2(g)}$ produced by combustion of $32\, g$ of oxygen.
Some Basic Concepts of Chemistry
Solution:
$32\, g$ of $O_2$ corresponds to one mole. Here we want 2 moles of oxygen to form 1 mole of $CO_2.$
$1\, mole$ of $CO_2 = 12 + 2(16) = 12 + 32 = 44 \,g$
$1 \,mole$ of $CO_{2}=44\,g\,CO_{2} \Rightarrow \frac{44\,g\,CO_{2}}{1\,mole\,CO_{2}}$
Here $2\, moles$ of $O_2$ gives $1 \,mole$ of $CO_2.$
$1 \,mole$ of $O_2$ gives $1/2\, mole$ of $CO_2$
Hence $1/2$ mole of $CO_{2} \Rightarrow \frac{1}{2}\times44\,g\,CO_{2}=22\,g\,CO_{2}$
$22 \,g$ of $CO_2$ is evolved when $32\, g\, O_2$ is heated.