1) For a given process at constant pressure, w is positive. This means that the
ID: 1027035 • Letter: 1
Question
1) For a given process at constant pressure, w is positive. This means that the process involves (I Pts) A) work being done by the system on the surroundings B) work being done by the surroundings on the system C) no work being done D) an equal amount of work done on the system and by the system E) work being done against a vacuum 2) The value of AH for the reaction below is-790 kJ. The enthalpy change accompanying the reaction of 0.95 g of S is kJ. (2 Pts) 2S (s) + 302 (g) 2SO3 (g) A) 23 B) -23 C)-12 D) 12 E)-790 3)The first law of thermodynamics can be given as , (1 Pt) B) rm" AH'f (products)-SmAH'f( reactants) C) for any spontaneous process, the entropy of the universe increases D) the entropy of a pure crystalline substance at absolute zero is zero E) AS re/T at constant temperatureExplanation / Answer
Ans 1 : B) Work being done by the surroundings on the system
Since the sign of w is positive , the work is done on the system by the surroundings , in order to increase the magnitude of the internal energy. If the sign of w was negative , the work would have been donw by the system on the surroundings.
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