1. What is the first law of thermodynamics? a) Heat cannot be converted to work
ID: 706347 • Letter: 1
Question
1. What is the first law of thermodynamics? a) Heat cannot be converted to work b) Matter and energy cannot be created nor destroyed. c) The entropy exceeds the enthalpy for every spontaneous process What is the second law of thermodynamics? a) The disorder of the universe increases with every spontaneous proces b) AS >0 c) Exothermic processes are spontaneous What is the third law of thermodynamics? 2. 3. One cannot create a perpetual motion machine of the second kind. a) b) The entropy of the universe is increasing. c) Entropy is zero at 0 degrees Kelvin What is the criterion for spontaneous change? a) AG 0 c) ?S > 0 4. Why do some exothermic reactions not occur spontaneously? a) AS is too high b) AG is less than zero c) AH is positive d) AS is negative and T is high. 5. For a reaction at 1000 K, Ho, -8000 J/mole and ASo-. 2.2 J/mole deg. 6. What is AGo for the reaction? a) 10193 J b) -3300J c) +10193 J What is Keq for the reaction? a) 1.17 b) 3.41 c) 5.11 7. The equilibrium constant for a reaction at 800°K is 14.2. If the en reaction is 30 kj/mole, what would the equilibrium constant be at a) 2.65 b) 36100 c) 7.1x 103 8.Explanation / Answer
1 st answer
b) Matter and energy cannot be created or destroyed
Reason :Total energy of isolated system is constant energy can be transformed from one form to another
2 nd answer
b) ?S>0
Reason : Change the in entropy never be negative
3rd answer
C) Entropy is zero at zero degree kelvin
4th answer
?S>0
Reason : according to 2nd law of thermodynamics
5th answer
d) ?S is negative and T is high
Reason: liquid is more orderly than a gas
6 th answer
a) ?G=?H-T?S
=-8000-1000(2.2)
=-10193 J
7th answer
b) ?G=-RT lnKeq
Keq=e(?G/RT)
Keq = 3.41. Since R=8.314j/mk
8th answer
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