Problem: Suppose that the gas-phase reaction 2NO(g) + O2(g) → 2NO2(g) were carried out in a constant-volume container at constant temperature.Would the measured heat change represent ΔH or ΔE?

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Internal Energy:


∆E=q+w


Recall that work (w) is given by:


w=-PΔV


At constant V → w = 0


∆E=q+0∆E=q

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Problem Details

Suppose that the gas-phase reaction 2NO(g) + O2(g) → 2NO2(g) were carried out in a constant-volume container at constant temperature.

Would the measured heat change represent ΔH or ΔE?

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