In a thermodynamical process, 300 joule of heat is supplied to a gas and 200 joule of work is done by the gas. What is the change in internal energy of the system?
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sign convention
heat given to the system = +ve
heat released by the system = -ve
work done by the system = +ve
work done on the system = -ve
now , apply first law of thermodynamics
dq= du+dw
300=du+200
du=100 joule
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