First slide

First law of thermo dynamics

Question

A system absorbs 800 joules of energy and does of work of 200 joules change in internal energy of the process is

Moderate

A

+ 600 J
B

- 600 J
C

+ 1000 J
D

- 1000 J

Solution

By IUPAC convention
Heat absorbed by the system = +Ve
Heat absorbed by the system = +800 J
Work done by the system = -Ve
Work done by the system = -200 J
$∆$ E= (+800 - 200) J
$∆$ E = +600 J .

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