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Question
A gas made of a mixture of 2 moles of oxygen and 4 moles of argon at temperature T. Calculate the energy of the gas in terms of RT. Neglect the vibrational modes.
Solution
For two moles of diatomic nitrogen with no vibrational mode,
U1 = `2 xx 5/2 "RT"` = 5 RT
For four mole of monatomic argon,
U2 = `4 xx 3/2 "RT"` = 6 RT
Total energy of the gas, U = U1 + U2
= 5 RT + 6 RT
U = 11 RT
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