For this problem, we have to calculate the enthalpy of reaction (ΔH) using the given bond enthalpies.
C (s) + 2 H2 (g) → CH4 (g)
Recall that the change of enthalpy for a chemical reaction (ΔH) can be calculated using bond energies:
To determine the enthalpy of reaction, we need to first see what bonds are present in the reactants and the products.
Estimate the enthalpy of reaction, ΔH rxn°, for each of the following reactions using the information provided. Show all work and circle your final answers.
C (s) + 2 H2 (g) → CH4 (g) ΔH°rxn = ?
a. -312 kJ
b. -221 kJ
c. -72 kJ
d. +63 kJ
e. +740 kJ