Question

Five moles of an ideal gas at 1 bar and 298 K is expanded into the vacuum to double the volume. The work done is ______.

Options

• C_V(T₂ − T₁)

• −RT(V₂ − V₁)

• −RT ln V₂/V₁

• zero

Answer 1

Five moles of an ideal gas at 1 bar and 298 K is expanded into the vacuum to double the volume. The work done is zero.

Explanation:

In expansion against vacuum,

p_ext = 0

w = −P_ext Δ_V = 0