4. A compression at a constant pressure of 20 kPa is performed on 9.0 moles of a
ID: 1397809 • Letter: 4
Question
4.
A compression at a constant pressure of 20 kPa is performed on 9.0 moles of an ideal monatomic gas (CV=1.5R). The compression reduces the volume of the gas from 0.26m3 to 0.12m3.What is the change in the internal energy of the gas? Let the ideal-gas constant R = 8.314 J/(mol • K).
zero
-4.2 kJ
-7.0 kJ
7.0 kJ
4.2 kJ
5.
110 kJ
170 kJ
-52 kJ
230 kJ
7.0 kJ
6.
A 2.10-mole sample of an ideal gas is allowed to expand at a constant temperature of 278 K. The initial volume is 14.5 L and the gas performs 945 J of work. What is the final volume of the container? Let the ideal-gas constant R = 8.314 J/(mol • K).
22.3 L
19.5 L
17.6 L
28.4 L
7.
As described by the first law of thermodynamics, the change in internal energy of a system is equal to _____.
the difference between the heat added and work performed
the product of the pressure and change in volume
the ratio of the heat added to the work performed
the sum of the heat added and work performed
4.
A compression at a constant pressure of 20 kPa is performed on 9.0 moles of an ideal monatomic gas (CV=1.5R). The compression reduces the volume of the gas from 0.26m3 to 0.12m3.What is the change in the internal energy of the gas? Let the ideal-gas constant R = 8.314 J/(mol • K).
zero
-4.2 kJ
-7.0 kJ
7.0 kJ
4.2 kJ
240J/mol. K.Explanation / Answer
Number 4:
Option B: -4.2 kJ
Number 6:
17.6 L
Number 7:
The sum of the heat added and work performed
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