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PhysicsBowl 2018 Q42


42) This question asks us to find the answer choice which could identify the gas in the given situation. The gas undergoes an isobaric process and gains 2100 Joules of heat. The heat transferred during an isobaric process can be expressed as shown.

Where Q is heat, C[p] is the isobaric constant, n is number of moles, and T is temperature.

When we plug our given values into this equation we can solve for C[p].

Where Q is heat, C[p] is the isobaric constant, n is number of moles, T is temperature, and R is the universal gas constant

If we had a monatomic gas, C[p] would turn out to be (5/2)*R. However, since we find that C[p] is (7/2)*R, we know that the situation must use a diatomic gas. Only one of the gases is a diatomic gas: carbon monoxide.


Answer: A

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