Work function units


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Diana_Diep2I
Posts: 130
Joined: Sat Aug 17, 2019 12:17 am

Work function units

Postby Diana_Diep2I » Thu Oct 31, 2019 10:19 am

Are work function units always supposed to be in Joules? So we convert if we're given kJ/mol like in the practice midterm questions right?

Jason Wu 1E
Posts: 101
Joined: Thu Jul 25, 2019 12:15 am

Re: Work function units

Postby Jason Wu 1E » Thu Oct 31, 2019 10:38 am

I think it really depends on the context of the question and what you are trying to solve. Within the practice midterm kJ per mole is used which may be needed to be converted to Joules per photon with dimensional analysis to solve the problem. However overall, when stating an answer that has energy, the SI Unit for it will always be Joules.

Emma Popescu 1L
Posts: 105
Joined: Wed Sep 11, 2019 12:16 am

Re: Work function units

Postby Emma Popescu 1L » Fri Nov 01, 2019 10:33 pm

Yes, the work function should always be in Joules so the units can later cancel out

Joanne Kang 3I
Posts: 50
Joined: Thu Jul 25, 2019 12:17 am

Re: Work function units

Postby Joanne Kang 3I » Fri Nov 01, 2019 11:04 pm

Yes. Work functions should always be in Joules and then you most likely also convert the moles to atoms as well(with Avogadro's num).

Kylie Lim 4G
Posts: 110
Joined: Sat Aug 17, 2019 12:15 am

Re: Work function units

Postby Kylie Lim 4G » Sat Nov 02, 2019 10:41 am

I think since you're likely to be using it with planck's constant, it's safest for units to be in joules

nehashetty_2G
Posts: 102
Joined: Thu Jul 25, 2019 12:15 am

Re: Work function units

Postby nehashetty_2G » Sat Nov 02, 2019 11:35 am

I have also seen questions that give the work function in the units eV, and in that case just remember that you can convert from eV to Joules using the conversion factor give on the conversion sheet which is 1ev is equal to 1.602 × 10-19 J.


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