A rigid, thermally insulated, sealed vessel contains a mixture of H 2 and O 2 which reacts explosively. Taking the contents as the system, which of the following is/are correct?

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The wall is rigid (w = 0), insulated (q = 0) and sealed (no matter exchange), so the system is isolated and Δ U = q + w = 0: (b), (d) true. The exothermic reaction converts chemical energy into thermal energy, so T and P rise even though U is constant: (a) false. The reaction is spontaneous in an isolated system, so Δ S sys > 0: (c) true. Ans: (b), (c), (d).

Chemistry - Thermodynamics - I Question with Solution | TestHub

Options:(select one or more)

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