Question 91 of 92
Q.In an adiabatic expansion of an ideal gas :
(a) w = -Δu
(b) w = Δu + ΔH
(c) Δu = 0
(d) w = 0
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Start your 14-day free trial to unlock the full solution →The key feature of an adiabatic process is that it is thermally insulated, so we apply the first law of thermodynamics with q = 0.
In an adiabatic process q = 0, so the work and the internal-energy change are directly related; the option expressing this is w = -Δu.
An adiabatic process is one in which no heat enters or leaves the system, i.e. q = 0. The first law of thermodynamics states ΔU = q + w. Setting q = 0 gives ΔU = w, meaning the entire change in internal energy comes from (or goes into) work. …
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