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A piston cylinder expands from 8 liter to 12 liter with the external pressure of 900 Pa, what is the work done on the system?

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A piston cylinder expands from 8 liter to 12 liter with the external pressure of 900 Pa, what is the work done on the system?

(a) 3.6 Joule

(b) – 3.6 Joule

(c) 7.2 Joule

(d) – 7.2 Joule

The question was posed to me during an online interview.

I need to ask this question from Energy Types topic in division Liquids and Gases in Equilibrium with Solids and Energy: Terminology, Concepts, and Units of Basic Chemical Engineering

1 Answer

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Right choice is (b) – 3.6 Joule

Easy explanation: Work done on the system = 900(8 – 12) = – 3600 mJ = – 3.6 J.

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