Consider the reaction.

2 upper c (s, graphite) plus upper h subscript 2 right arrow upper c subscript 2 upper h subscript 2 (g).

standard enthalpies of formation
substance
dhf (kj/mol)
c2 h2 (g)
226.73
caco3 (s)
–1206.92
cao (s)
–635.09
co (g)
–110.525
co2 (g)
–393.509
h 2 o (i)
–285.8
h 2 o (g)
–241.818
c (s), diamond
1.895
c (s), graphite
0.0

based on the equation and the information in the table, what is the enthalpy of the reaction?
use delta h r x n equals the sum of delta h f of all the products minus the sum of delta h f of all the reactants..

–453.46 kj
–226.73 kj
226.73 kj
453.46 kj