Consider the following processes: I. condensation of a liquid II. increasing the
ID: 517777 • Letter: C
Question
Consider the following processes: I. condensation of a liquid II. increasing the volume of 1.0 mol of an ideal gas at constant temperature III. dissolving sugar in water IV. heating 1.0 mol of an ideal gas at constant volume For how many of these is Delta S positive? A) 0 B) 1 C) 2 D) 3 The second law of thermodynamics states that: A) The entropy of a perfect crystal is zero at 0 K. B) The entropy of the universe is constant. C) The energy of the universe is increasing. D) The entropy of the universe is increasing. E) The energy of the universe is constant. A chemical reaction is most likely to be spontaneous if it is accompanied by A) increasing energy and increasing entropy B) lowering energy and increasing entropy C) increasing energy and decreasing entropy D) lowering energy and decreasing entropy 4-6: At l atm, liquid water is heated above 100 degree C. Delta S_surr for this process is A) greater than zero B) less than zero C) equal to zero D) more information needed to answer this question Delta S_sys for this process is A) greater than zero B) less than zero C) equal to zero D) more information needed to answer this question E) none of these (A-D) S_univ for this process is A) greater than zero B) less than zero C) equal to zero D) more information needed to answer this question E) none of these (A-D)Explanation / Answer
1. Answer:-D
Process 1 involves decrease in entropy while other involve increase in entropy
2. D
According to second law of thermodynamics the entropy change of universe is always positive or entropy of universe keep on increasing
3. B
The direction of spontaneous change is the one involving dispersal of total energy or involving decreasing energy and increasing entropy