Question 6.1: A certain gas expands in volume from 2.0 L to 6.0 L at const...

A certain gas expands in volume from 2.0 L to 6.0 L at constant temperature. Calculate the work done by the gas if it expands (a) against a vacuum and (b) against a constant pressure of 1.2 atm.

Strategy Organize the data from the problem:

Initial volume = 2.0 L ΔV = (6.0 − 2.0) L = 4.0 L Final volume = 6.0 L

(a) P = 0, (b) P = 1.2 atm.

The work done in gas expansion is equal to the product of the external, opposing pressure and the change in volume. What is the conversion factor between L · atm and J?

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