Internal energy

"What is the internal energy of 10 moles of helium at 100 K?"
The same question is asked about 10 moles of oxygen. I’m going to guess PV=nRT which would give 8,314 J as the PV value. Because (at least in chemistry this is true) delta H = delat E +/- work and work = PV, so PV would somehow resemble "internal energy." The answer given is 12,473 J which is 3/2 of the calculation. I know I am on the right track but it would be helpful if someone could just throw it together for me. Thanks

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