First slide

First law of thermo dynamics

Question

What is the change in the energy of system if 500 cal of heat energy are added to a system and system does 350 cal of work on the surroundings?

Easy

A

-150 cal
B

+150 cal
C

+ 850 cal
D

-850 cal

Solution

Heat absorbed, q = 500 cal
Work done by the system W = -350 cal
According to the first law of thermodynamics,
$ΔE = q + W = 500 + (- 350) = + 150 cal$

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