Elementary Principles 251 - 7.13 (a) Ref state U = 0 liquid...

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7- 6 0 7.13 (a) Ref state ± U =⇒ 0 di liquid Bromine @ 300 K, 0.310 bar (b) Δ ±± ± ... UU U =− =−= final initial kJ mol 0 000 28 24 28 24 ΔΔΔ Δ Δ ± ± ± HU P V U P V =+ (Pressure Constant) ( ) 3 0.310 bar 0.0516 79.94 L 8.314 J 1 kJ ˆ 28.24 kJ mol 30.7 kJ mol mol 0.08314 L bar 10 J H Δ= + = ΔΔ HnH == = ± .. . 500 30 7 15358 154 mol kJ / mol kJ kJ bg b g (c) ± U independent of PU U ⇒== ± ,. ± . 300 0 205 300 0 310 2824 K bar bar kJ mol ± , ± UP U f 340 340 1 29 62 K .33 ba r k Jmo l Δ Δ ± ± . U U E final initial kJ mol 29 62 28 24 1380 ± ± ± ± . . V changes with pressure. At constant temperature PV = P' V' V'= PV / P' V'(T = 300K, P = 0.205 bar) = (0.310 bar)(79.94 L / mol) bar L/mol ⇒⇒ = 0205 12088 n 00414 . . L1 m o l 120.88 L mol UnU = ± 0 0414 138 0 mol kJ / mol .0571 kJ b g Δ UE EQ W kp ++= = Q 0 0571 . k J (d) Some heat is lost to the surroundings; the energy needed to heat the wall of the container is being neglected; internal energy is not completely independent of pressure.
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This note was uploaded on 02/27/2012 for the course CHEMICAL E 312 taught by Professor Cheung during the Fall '11 term at The University of Akron.

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