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enthalpy and internal energy

Hi, i'm about confused about the difference between enthalpy and internal energy, could anyone help me understand it?

Also, why is delta U measured in calorimetry, not delta H? Is it because calorimeters are constant volume?
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Borek
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Original post by jacksonmeg
Also, why is delta U measured in calorimetry, not delta H? Is it because calorimeters are constant volume?


Yes. ΔH = ΔU + pΔV, so when the V=const ΔV=0, and ΔU=ΔH.

And that's actually the difference between the ΔU and ΔH - one takes into account volumetric work, the other doesn't.

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