Answer
$χ_{CO_2} = 0.0138$
Work Step by Step
$$χ_{CO_2} = \frac{n_{CO_2}}{n_{Total}}$$
$n_{Total} = 0.756 + 0.189 + 0.0132 = 0.9582 mol$
$n_{CO_2} = 0.0132mol $
$χ_{CO_2} = \frac{0.0132}{0.9582}$
$χ_{CO_2} = 0.0138$
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