Question

What will be the weight of $CO$ having the same number of oxygen atoms as present in $22g$ of $C{O}_2$?

• A. $28g$
• B. $22g$
• C. $44g$
• D. $72g$

Answer 1

Answer: (A)

No. of $O$ atoms in $C{O}_2=2$
Molar mass of $C{O}_2=44g$
$44g\equiv 1$ mol $\Rightarrow 22g\equiv 0.5$ mol
$1$ mole of $C{O}_2$ contains $=2\times 6.023\times 10^{23}O$ atoms
$0.5$ mole of $C{O}_2=6.023\times 10^{23}O$ atoms
$1$ mole of $CO=6.023\times 10^{23}O$ atoms
Mass of $1$ mole of $CO=12+16=28g$