Question

A gas can expand from 100 mL to 250 mL undera constant pressure of 2 atm. The work done by the gas is

• A. 30.38 joule
• B. 25 joule
• C. 5 k joule
• D. 16 joule

Answer 1

Answer: (A)

30.38 joule

Answer 2

$\Delta$V = 250 mL - 100 mL = 150 mL = 0.15 L $P_{ext}$ = 2 atm W = -$P_{ext} \times \Delta$ V = - (0.15 L) $\times$ (2 atm) = - 0.3 Latm. = $-0.3 \times 1.01325 \times 10^2J$ = 30.3975 J.