# thermodynamic

When 1.0 mole of liquid Br2 is converted to Br2 vapour at 25.0oC and 1.0 atm pressure, 7.3 Kcal of heat is absorbed, and 0.59 kcal of expansion work is done by the system. Calculate ΔU for this process

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1. impatient much? reposting just wastes everyone's time.

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oobleck
2. dU = q + w
q = + 7.3 kcal.
w = -pdV = -p(V2-V1) = -59 kcal.
Note: If you use kcal for the units, obviously dU will be in kcal. Or do you want the units in joules. If so convert.

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DrBob222

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