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The internal energy change when a system goes from state A to B is 40 kJ mol-1. If a 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
Correct answer is option 'D'. Can you explain this answer?
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The internal energy change when a system goes from state A to B is 40 ...
For a cyclic process the net change in the internal energy is zero because the change in internal energy doesnot depend on the path.
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The internal energy change when a system goes from state A to B is 40 ...
The net change in internal energy of a system can be determined by considering the path taken to reach the final state from the initial state. In this case, the system goes from state A to state B by a reversible path and then returns to state A by an irreversible path. The net change in internal energy can be calculated by considering the overall change in internal energy along each path and then subtracting the energy change along the irreversible path.
1. Internal Energy Change from A to B by a Reversible Path:
The internal energy change when the system goes from state A to state B by a reversible path is given as 40 kJ mol-1. This means that the internal energy of the system increases by 40 kJ mol-1 during this process.
2. Internal Energy Change from B to A by an Irreversible Path:
When the system goes from state B back to state A by an irreversible path, the internal energy change can be different from the initial change. However, the net change in internal energy is independent of the path taken.
3. Net Change in Internal Energy:
Since the net change in internal energy is independent of the path taken, it will be the same regardless of whether the system goes from A to B by a reversible path and returns to A by an irreversible path or vice versa. In this case, the net change in internal energy will be zero.
Explanation:
When the system goes from A to B by a reversible path, the internal energy increases by 40 kJ mol-1. However, when the system returns from B to A by an irreversible path, the internal energy may decrease or increase, but the overall change will be such that the net change in internal energy is zero. This is because the internal energy is a state function, meaning it only depends on the initial and final states of the system, not on the path taken. Therefore, the net change in internal energy is zero.
In conclusion, the net change in internal energy when a system goes from state A to B by a reversible path and returns to state A by an irreversible path is zero.
1. Internal Energy Change from A to B by a Reversible Path:
The internal energy change when the system goes from state A to state B by a reversible path is given as 40 kJ mol-1. This means that the internal energy of the system increases by 40 kJ mol-1 during this process.
2. Internal Energy Change from B to A by an Irreversible Path:
When the system goes from state B back to state A by an irreversible path, the internal energy change can be different from the initial change. However, the net change in internal energy is independent of the path taken.
3. Net Change in Internal Energy:
Since the net change in internal energy is independent of the path taken, it will be the same regardless of whether the system goes from A to B by a reversible path and returns to A by an irreversible path or vice versa. In this case, the net change in internal energy will be zero.
Explanation:
When the system goes from A to B by a reversible path, the internal energy increases by 40 kJ mol-1. However, when the system returns from B to A by an irreversible path, the internal energy may decrease or increase, but the overall change will be such that the net change in internal energy is zero. This is because the internal energy is a state function, meaning it only depends on the initial and final states of the system, not on the path taken. Therefore, the net change in internal energy is zero.
In conclusion, the net change in internal energy when a system goes from state A to B by a reversible path and returns to state A by an irreversible path is zero.
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The internal energy change when a system goes from state A to B is 40 kJ mol-1. If a 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 KJb)> 40 KJc)< 40 KJd)ZeroCorrect answer is option 'D'. Can you explain this answer?
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