Question

Calculate the amount of work done in bar dm³ when 2 moles of an ideal gas expands isothermally from a volume of 155 dm³ to 200 dm³ against a constant external pressure of 1 bar.

Options

• −0.022

• −0.040

• −0.045

• −0.055

Answer 1

−0.045

Explanation:

W = −P_ext × ΔV

= −1 bar × (0.2 dm³ − 0.155 dm³)

= −1 bar × 0.045 dm³

= −0.045 bar dm³