What are the correct thermodynamic conditions for the free expansion of an ideal gas in an insulated — Thermodynamics and Thermochemistry Chemistry Question

💡 Solution & Explanation

Free expansion occurs against a vacuum ($P_{ext} = 0$), so work done $w = 0$. In an insulated container, it is adiabatic ($q = 0$). By the First Law, $\Delta U = q+w = 0$. For an ideal gas, $\Delta U = 0$ implies $\Delta T = 0$.