Answer
There are 0.568 mole in 25.0 g of $CO_2$
Work Step by Step
1. Determine the molar mass of this compound (CO_2), and setup the conversion factors:
Molar mass :
$C: 12.01g $
$O: 16.00g * 2= 32.00g $
12.01g + 32.00g = 44.01g
$ \frac{1 \space mole \space (CO_2)}{ 44.01 \space g \space (CO_2)}$ and $ \frac{ 44.01 \space g \space (CO_2)}{1 \space mole \space (CO_2)}$
2. Calculate the number of moles $(CO_2)$
$ 25.0g \times \frac{1 mole}{ 44.01g} = 0.568 mole$
