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Energetics question help

Hi i am having a hard time understanding this question, could someone perhaps guide me as to how to go through it, thanks.

Q1. Calculate the enthalpy of formation of butane (C4H10) from the following data: Enthalpy of combustion of graphite = -393.6 kJmol-1 Enthalpy of combustion of hydrogen = -285.9 kJmol-1 Enthalpy of combustion of butane = -2877.1 kJmol-1

i
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Original post by mbk1
Hi i am having a hard time understanding this question, could someone perhaps guide me as to how to go through it, thanks.

Q1. Calculate the enthalpy of formation of butane (C4H10) from the following data: Enthalpy of combustion of graphite = -393.6 kJmol-1 Enthalpy of combustion of hydrogen = -285.9 kJmol-1 Enthalpy of combustion of butane = -2877.1 kJmol-1

i

What have you tried so far? Have you drawn a Hess cycle and labelled the arrows?

Useful page here: https://chemguide.co.uk/physical/energetics/sums.html

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