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Work function units

Posted: Thu Oct 31, 2019 10:19 am
by Diana_Diep2I
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?

Re: Work function units

Posted: Thu Oct 31, 2019 10:38 am
by Jason Wu 1E
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.

Re: Work function units

Posted: Fri Nov 01, 2019 10:33 pm
by Emma Popescu 1L
Yes, the work function should always be in Joules so the units can later cancel out

Re: Work function units

Posted: Fri Nov 01, 2019 11:04 pm
by Joanne Kang 3I
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).

Re: Work function units

Posted: Sat Nov 02, 2019 10:41 am
by Kylie Lim 4G
I think since you're likely to be using it with planck's constant, it's safest for units to be in joules

Re: Work function units

Posted: Sat Nov 02, 2019 11:35 am
by nehashetty_2G
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.