Question

Question #ae5d8

Answer 1

Here's my work

Explanation:

First gather the information about the `DeltaHf` of all the substances

`"substance" color(white)(mmmmm)DeltaHf`
`CO color (white)(mmmmmm)−110.5 kJ·mol^(−1)`
`O_2color (white)(mmmmmmmm) 0 kJ*mol^(-1)`
`CO_2 color (white)(mmmmm)−393.5kJ·mol^(−1)`

Always remember elements have `DeltaHf` as 0

`DeltaH_"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 `DeltaHf` 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.