A gas expands against a constant external pressure of 2.00 atm, increasing its volume by 3.40 L. Simultaneously, the system absorbs 400 J of heat from its surroundings. What is ΔE, in joules for this gas ?
A
-689
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B
-289
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C
400
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D
289
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Solution
The correct option is C -289
First law of thermodynamics:
This law is based upon the conservation of energy,
The mathematical form of the first law of thermodynamics is: