# The number of moles present in "44 g" of "CO"_2 ?

$\text{0.9998 mols" -> "1.0 mols}$ (2 sig figs)
$C {O}_{2}$ has a molar mass of $44.009 \setminus \text{g/mol}$. That means that one mole of $C {O}_{2}$ has a mass of $44.009 \setminus \text{g}$.
So, in $44 \setminus \text{g}$ of $C {O}_{2}$, there is a little under one mole of ${\text{CO}}_{2}$.