(Solution) - Nitric oxide NO reacts with molecular oxygen as follows 2NO g -(2025 Original AI-Free Solution)

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Nitric oxide (NO) reacts with molecular oxygen as follows:
2NO(g) + O2(g) ? 2NO2(g)
Initially NO and O2 are separated as shown here. When the valve is opened, the reaction quickly goes to completion. Determine what gases remain at the end and calculate their partial pressures. Assume that the temperature remains constant at 25°C.