13.Which of the following gases has the lowest molar entropy at STP? A. Xenon B.
ID: 878976 • Letter: 1
Question
13.Which of the following gases has the lowest molar entropy at STP?
A. Xenon B. Krypton C. Radon D. Neon E. Argon
14. For which of the following will the entropy of the system increase?
A. Condensation of steam
B. Reaction of magnesium metal with oxygen to form magnesium oxide
C. Reaction of nitrogen and hydrogen gases to form ammonia
D. Sublimation of dry ice
E. None of these
15. The reaction of A(g) B(g) is spontaneous under standard state conditions. Which of the following statements must be true?
(1) The reaction B(g) A(g) is non-spontaneous under standard state conditions.
(2) A(g) will be completely converted to B(g) if sufficient time is allowed.
(3) A(g) will be converted to B(g) rapidly.
A. (1) B. (1) and (2) C. (1) and (3) D. (1), (2), and (3) E. None of these
16.Which of the following processes are spontaneous?
(1) Dissolving more solute in an unsaturated solution.
(2) Dissolving more solute in a saturated solution.
(3) Dissolving more solute in a supersaturated solution.
A. (1) B. (1) and (2) C. (1) and (3) D. (1), (2), and (3) E. None of these
17.What is W in Boltzmann’s equation, S = klnW?
A. A fraction indicating the probability of obtaining a result
B. A random number
C. The number of ways of obtaining a state
D. PV Work
E. The gas constant, R, times Avogadro’s number
18. Consider 2 dice, each numbered 1 – 6. Both dice are rolled simultaneously. Which of the following outcomes has the highest entropy associated with it?
A. Rolling a 2 B. Rolling a 4 C. Rolling an 8 D. Rolling a 10 E. Rolling a 12
19. Under which set of temperature/volume conditions would one mole of Ne have the highest entropy?
A. 0°C, 25 L B. 27°C, 25 L C. 137°C, 25 L D. 27°C, 35 L E. 137°C, 35 L
Explanation / Answer
Answer –
13) D. Neon
As the molar mass of increase the molar entropy of gases are increase, so the lowest molar entropy is for the Ne, because Ne has the smallest molar mass than others.
14) D. Sublimation of dry ice
We know the entropy is the degree of randomness, so in the gases phase degree of randomness is more than liquid then solid. So when phases changes from solid to liquid, solid to gas and liquid to gases degree of randomness increase and reverse way it is decrease. So from the given option only Sublimation of dry ice has degree of randomness increase, means solid to gas.
15) D. (1), (2), and (3)
We are given reaction A ---> B is spontaneous means at same condition when it is reverse reaction is non- spontaneous, so first statement is correct. Second statement also correct A(g) will be completely converted to B(g) if sufficient time is allowed. We know spontaneous reaction are proceed rapidly.
16) A. (1)
We know spontaneous process means the process which completely it own and no need any externally force. When solution is unsaturated then there is allow more solute dissolved, but in the saturate and super saturate ther is no further solute will allow for dissolving, means there is solute is not dissolved its own, there is need some external forces.
19) E. 137°C, 35 L
As the volume and temperature increase entropy also increase, so answer is 137°C, 35 L
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.