Question #ae5d8

1 Answer
Apr 5, 2017

Answer:

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.