# Question ae5d8

Apr 5, 2017

Here's my work

#### Explanation:

First gather the information about the $\Delta H f$ of all the substances

$\text{substance} \textcolor{w h i t e}{m m m m m} \Delta H f$
CO color (white)(mmmmmm)−110.5 kJ·mol^(−1)
${O}_{2} \textcolor{w h i t e}{m m m m m m m m} 0 k J \cdot m o {l}^{- 1}$
CO_2 color (white)(mmmmm)−393.5kJ·mol^(−1) 

Always remember elements have $\Delta H f$ as 0

$\Delta {H}_{\text{rxn" = DeltaH"f of product(s)" - DeltaH"f of reactant(s)}}$

If there is a coefficient in front of the substance like C 2CO multiply the $\Delta H f$ by the coefficient

DeltaH_"rxn" = −393.5kJ·mol^(−1) *2 -(−110.5 kJ·mol^(−1) + 0)2

DeltaH_"rxn" = −393.5kJ·mol^(−1)*2+110.5 kJ·mol^(−1)*2 

DeltaH_"rxn" = -566kJ·mol^(−1)#

This means that the reaction is exothermic.