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# PS1 - o C 3 1.000 mol of benzene freezes at 5.5 o C in a...

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APSC 132 PROBLEM SET 1 1. 0.500 mol of an ideal gas expands at a constant temperature of 0 o C from an initial pressure of 5.000 atm to a final pressure of 0.500 atm. Calculate q , w , D E and D H for both a reversible expansion and for an irreversible expansion. 2. Calculate the entropy changes for the following processes: 5.00 mol of N 2 gas expands from 100 L to 1000 L at 27 o C 2.00 mol of ice are melted at 0 o C and 101 kPa ( D H f for ice is 334 J/g) 1.00 mol of ice at –5 o C is heated to form water at 50 o C and 1.00 atm (C p (ice) = 2.09 J/g.K and C p (water)=4.18 J/g.K) 1.00 mol of steam is reversibly compressed to form water(l) at 100 o C ( D H vap (water) = 2.259 kJ/g) 1.00 mol of an ideal gas expands against a vacuum from 10 atm to 1 atm at a constant temperature of of 27
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Unformatted text preview: o C 3. 1.000 mol of benzene freezes at 5.5 o C in a vessel that is immersed in an ice-water mixture. Calculate the entropy changes from the benzene, the ice-water mixture and the total entropy change for the universe (for benzene T f =5.5 o C and D H f =125 J/g). 4. An iceberg with a mass of 1.00 x 10 9 kg at a temperature of 0 o C drifts into the Gulf Stream, which is at a temperature of 20 o C. After several weeks, there remains only water at 20 o C. What is the entropy change in the universe associated with the disappearance of the iceberg? Note : 1 L.atm = 101.3 J, 1 L.Pa = 1 J. Missing D H and C p values may be found in Appendix D. C p – C v = R for any ideal gas....
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