What amount of heat (in J) is to be transferred to an equimolar mixture of helium and nitrogen in the isobaric heating process for the mixture to perform the work 2.0 J?

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Take 1 mol He + 1 mol N₂ (2 mol total). At constant pressure W = n t otal RΔT = 2RΔT. Heat: Q = (C p ,He + C p ,N₂)ΔT = ((5/2)R + (7/2)R)ΔT = 6RΔT. Hence Q = 3W = 6 J. (The trap: C p of the mixture must be built from both components, not read off as diatomic or monoatomic alone.)

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