What is the change of energy on the surrounding when a system does 15J of work on the surrounding and 13J of work are added to the system.
1. 2J
2. -2J
3. 28J
4. -28J
5. 15J
Please help It's Chemistry and This is very important for me.?
2017-08-09 9:34 pm
回答 (2)
2017-08-10 12:35 am
When the system does 15 J of work on the surroundings :
Change of energy on the surroundings = +15J
When 13 J of work are added to the system (by the surroundings) :
Change of energy on the surroundings = -13J
Overall change of energy on the surroundings = (+15 - 13) J = +2J
Hence, the answer: 1. 2J
Change of energy on the surroundings = +15J
When 13 J of work are added to the system (by the surroundings) :
Change of energy on the surroundings = -13J
Overall change of energy on the surroundings = (+15 - 13) J = +2J
Hence, the answer: 1. 2J
2017-08-09 9:39 pm
2. -2J because by convention, when the system does work it is negative, and when the surrounding do the work, it is positive. So, here you have -15 J + 13 J = -2 J.
收錄日期: 2021-05-01 13:43:01
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