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Entropy Calculations Help

Hi I think I understand the method to work out delta s total.However in the first step when doing enthalpy and using the data book. Do I not use numbers for molecules like Br2 because formation data doesn't exist?
I'm sorry if this doesn't make sense, I can expand , I just want a bit of clearing up.
Original post by Katie9876
Hi I think I understand the method to work out delta s total.However in the first step when doing enthalpy and using the data book. Do I not use numbers for molecules like Br2 because formation data doesn't exist?
I'm sorry if this doesn't make sense, I can expand , I just want a bit of clearing up.


It's not that the enthalpy of formation data does not exist it's equal to zero for elements ...
Reply 2
Thanks you! That's what I thought but wanted to check

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