Q.

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?

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a

-150 cal

b

+150 cal

c

+ 850 cal

d

-850 cal

answer is B.

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Detailed Solution

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