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Postby RyanTran2F » Sun Mar 11, 2018 1:56 pm

When we find reaction enthalpies based on bond enthalpies, we multiply the enthalpy (kJ/mol) to break a bond by the number of bonds (mol) so why does the answer in the answer key sometimes have units as kj/mol (ex. 8.75)? Would it be acceptable if we just put units as kJ? Thanks :)
Last edited by RyanTran2F on Sun Mar 11, 2018 4:53 pm, edited 1 time in total.

Justin Chu 1G
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Re: Units

Postby Justin Chu 1G » Sun Mar 11, 2018 2:00 pm

Generally, the units are in kJ/mol. If anything, though, I think you can leave the answer in just kJ but definitely not just mol.

Tiffany 1B
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Re: Units

Postby Tiffany 1B » Sun Mar 11, 2018 2:12 pm

I think this is bc what youre finding is delta H rxn so per mole of product or whatever youre measuring, if I remember correctly. I think they said they wouldnt mark off points for using just kJ vs kJ/mol tho.. Hope that helps.

Warda Sahib 2J
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Re: Units

Postby Warda Sahib 2J » Thu Mar 15, 2018 6:45 pm

The units are in KJ/mol but KJ alone should also be ok

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