Problem: ΔH = ΔE when:A. 2NH3(g) goes from 225 °C to 120 °C at constant pressure. B. Liquid water goes to water vapor at some temperature and pressure C. 2 moles of hydrogen iodide gas in a 40 L container produce hydrogen gas and iodine gas D. None of the above

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We are asked which of the given situations would have ΔH = ΔE :

Recall that ΔH  is related to ΔE by the following equation: 

H =E + PV


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Problem Details

ΔH = ΔE when:

A. 2NH3(g) goes from 225 °C to 120 °C at constant pressure. 

B. Liquid water goes to water vapor at some temperature and pressure 

C. 2 moles of hydrogen iodide gas in a 40 L container produce hydrogen gas and iodine gas 

D. None of the above

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