Question

Can someone please provide an explanation of how to calculate the heat of reaction for the...

Can someone please provide an explanation of how to calculate the heat of reaction for the following:

CH4(g) + 2O2(g) -> CO2(g) + 2H2O(g)

Answer is kJ/mol

Thank you!

Homework Answers

Answer #1

Ans :-

Given reaction is :

CH4 (g) + 2O2 (g) -------------> CO2 (g) + 2H2O (g), ΔH0rxn = ?

As,

ΔH0rxn = [Sum of enthalpy of formation of products] - [Sum of enthalpy of formation of reactants]

= [1 x ΔH0f of CO2 (g) + 2 x ΔH0f of H2O (g)] - [1 x ΔH0f of CH4 (g) + 2 x ΔH0f of O2 (g)]

= [1 x (–393.5 KJ/mol) + 2 x (–241.8 KJ/mol)] - [1 x (–74.6 KJ/mol) + 2 x 0.0 KJ/mol]

= [-393.5 KJ/mol - 483.6 KJ/mol] - [-74.6 KJ/mol]

= - 877.1 KJ/mol + 74.6 KJ/mol

= - 802.5 KJ/mol

Therefore, the heat of the reaction = ΔH0rxn = - 802.5 KJ/mol
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