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Practice Exam Questions on Thermodynamics
1
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2
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A2
B2
The process is spontaneous in the forward direction at high temperatures, but not at low
temperatures
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3
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8 kJ is transferred to the surroundings
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Also
calculate ∆H f˚ for N2H4(l)
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When a certain quantity of heat is transferred to one mole of N2 gas at constant volume, the
temperature of the N2 rises
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Will the temperature
rise be the same for both gases or will one be higher (which one) than the other? Explain
clearly the fundamental reasons behind your answer
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The enthalpy of vaporization of ethanol (CH3CH2OH) is 38
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Assume that we have ethanol liquid and vapor under equilibrium conditions
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00 mol of ethanol is vaporized reversibly at 78˚C at a
constant 1 atm pressure
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6
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”
Is Bill correct? Be sure to discuss the reasons for your answer and to state clearly the Second
Law
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A 1
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The temperature of the water rose from 23
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0°C
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8
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9
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05 atm of NO; 0
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5 atm of NO2
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USEFUL INFORMATION
L atm
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0821 mole K = 8
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184 J/g-K
1

atm = 760 torr = 760 mm Hg;

PV = nRT;

x =

−b +

1 L atm = 101
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+ ΔSsys
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0
35
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0
12
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0

Th

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