Change In Internal Energy When One Mole Of Liquid Chlorine Changes Phase To Chlorine Gas At SBP
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Change In Internal Energy When One Mole Of Liquid Chlorine Changes Phase To Chlorine Gas At SBP

What is ΔE (change in internal energy) when liquid chlorine changes phase to chlorine gas at standard boiling point, 284oK (vapor pressure 1 atm)? The enthalpy of vaporization of chlorine, Cl2, is 20.41 KJ/mole.

The strings:

S7P5A51 (Change - Physical Change)

The math:
Pj Problem of Interest is of type change (change in internal energy).

The equation of interest is:
enthalpy change (ΔH) = internal energy change (ΔE) + pressure-volume work (PΔV)

So, ΔH = ΔE + PΔV -------------(1)

So, ΔE = ΔH - PΔV ------------(2)

PΔV = nRT.
where, n is number of moles, R is universal gas constant = 8.315, T = temperature degrees K.
So, PΔV =1 x 8.315 x 284 = 2361.46 Joules/mole = 2.362KJ/mole.

ΔE = 20.41 - 2.362 = 18.05KJ/mole.

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