Question

$88g$ of ${CO}_2$ gas at STP is kept in a gas jar. How many moles of ${CO}_2$ are present in the gas jar?
(Hint: Atomic mass of $C=12,O=16$)

Answer 1

Molecular weight of ${CO}_2=12+(2\times 16)=44kg$
Moles of ${CO}_2=88g/44g=2$ moles