Question

# For an adiabatic free expansion of an ideal gas, which of the following is true?q=0, w=0, ΔU=0q=0, w=+ve, ΔU=−veq=0, w=+ve, ΔU=+veq=+ve, w=0, ΔU=−ve

Solution

## The correct option is A q=0, w=0, ΔU=0ΔU=q+w For a free expansion work done is zero, since the external pressure is zero. For an adiabatic process, q=0 Hence, from first law ΔU=0

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