## deltaH Units

Clarisse Wikstrom 1H
Posts: 63
Joined: Fri Sep 29, 2017 7:05 am

### deltaH Units

When putting our final answer, how do we know whether the units for deltaH are kJ or kJ/mol? I've seen both so I was wondering if we would get marked off on the test if we wrote the wrong one. Thanks!

Sophie Krylova 2J
Posts: 59
Joined: Fri Sep 29, 2017 7:06 am

### Re: deltaH Units

Usually you would give the answer in the same units as the data given.

Deap Bhandal L1 S1J
Posts: 77
Joined: Fri Sep 29, 2017 7:05 am
Been upvoted: 2 times

### Re: deltaH Units

An example would be the delta H of a reaction is in kJ. However delta H formation could be written in kJ/mole of the product if we divide the original number by the molar coefficient of the product. The kJ/mole is specific for a substance and if you know the amount of moles of the substance you can convert between the two.

CalebBurns3L
Posts: 47
Joined: Fri Sep 29, 2017 7:07 am

### Re: deltaH Units

You have to write out the units for each step of the reaction so you know what units your final answer should be in.

Jimmy Zhang Dis 1K
Posts: 30
Joined: Fri Sep 29, 2017 7:05 am

### Re: deltaH Units

I believe that standard delta H and delta H of a reaction are in KJ while delta H of formation is in KJ/mol

Chris Lamb 1G
Posts: 58
Joined: Fri Jun 23, 2017 11:39 am

### Re: deltaH Units

I was under the impression that when calculating the standard reaction enthalpy, we use kJ/mol. For just regular reaction enthalpy, I would put kJ. But I would like to know if that is true or not.

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