Thermodynamics Test

Result

Thermodynamics Test - 16

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Question 1
4 / -1

A

B

C

D

Solution
Question 2
4 / -1

A
780.086 kcal

B
- 780.086 kcal

C
- 390.043 kcal

D
390.043 kcal
Question 3
4 / -1

A piston filled with 0.04 mole of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant temperature of 37.0°C. As it does so, it absorbs 208 J of heat. The values of q and W for the process will be
( R = 8.314 J / mol K, In 7.5 = 2.01)

A
q = + 208 J , W = - 208 J

B
q = - 208 J , W = - 208 J

C
q = - 208 J , W = + 208 J

D
q =+ 208 J , W =+ 208 J

Solution
Question 4
4 / -1

Based on the first law of thermodynamics, which one of the following is correct ?

A
For an isochoric process = ∆E = - Q

B
For an adiabatic process = ∆E = - W

C
For an isothermal process = Q = + W

D
For a cyclic process = Q = - W
Question 5
4 / -1

A
r + s

B
r - s

C
s - r

D
rs

Solution
Question 6
4 / -1

A
- 26.4 kcal

B
41.2 kcal

C
26.4 kcal

D
229.2 kcal

Solution
Question 7
4 / -1

At 27° C one mole of an ideal gas is compressed isothermally and reversible from a pressure of 2 atm to 10 atm. The value of ∆ E and q are (R = 2 cal)

A
0, - 965.84 cal

B
- 965.84 cal, - 865.58 cal

C
+ 865.58 cal, - 865.58 cal

D
+ 965.84 cal, + 865.58 cal

Solution
Question 8
4 / -1

The internal energy changes when a system goes from state A to B is 40 kJ / mol. If the system goes from A to B by a reversible path and returns to state A by an irreversible path, what would be the net change in internal energy ?

A
40 kJ

B
> 40 kJ

C
< 40 kJ

D
Zero
Question 9
4 / -1

A
110.5 kJ / mol

B
676.1 kJ / mol

C
282.8 kJ / mol

D
300.0 kJ / mol
Question 10
4 / -1

A gas expands isothermally against a constant external pressure of 1 atm from a volume of 10 dm³ to a volume of 20 dm³. It absorbs 800 J of thermal energy from its surroundings. The ∆U is

A
- 312 J

B
+ 123 J

C
- 213 J

D
+ 231 J

Solution