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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: kearao on June 20, 2018, 03:52:51 PM

Title: Enthalpy change data
Post by: kearao on June 20, 2018, 03:52:51 PM

Hi

I am writing a report for an assignment and am struggling to find anything online about what larger/smaller enthalpy change values indicate and was wondering if anyone can help?

For example I have written for a reaction where the ΔH = +68 kJ mol that this is the smallest value out of the examples because the breaking of bonds in reactants and making of bonds in the products balance each other out.

I want to include something similar for the following to explain why it is such a large value:
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O ΔH = -2220kJ mol–1

Does a large/small enthalpy change value indicate anything in particular about the reactions or am I barking up the wrong tree?

Thanks in advance!

Title: Re: Enthalpy change data
Post by: Babcock_Hall on June 20, 2018, 05:26:40 PM

Are all chemical bonds equal in strength?