# a diatomic gas at 333K has an internal energy of 2930J. how many moles of gas are present?

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- anonymousLv 711 months agoFavorite Answer
internal energy diatomic gas:

U = (5/2) nRT

U = internal energy

n = number of moles

R = gas constant = 8.314 J/mol･K

T = temperature (Kelvin)

rearranging to solve for n,

n = (2/5) E / RT

= (2/5) x {2930 J / [(8.314 J/mol･K) x (333 K)]}

= 0.423 mole …. to 3 sig figs

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