For N₂O₄(g) ⇌ 2 NO₂(g), Kp = 0.15 bar at 298 K. An equilibrium mixture of the two gases in a cylinder has a total pressure of 1.00 bar. The piston is pushed in until the volume is halved, and the temperature is brought back to 298 K. What is the partial pressure of NO₂ once equilibrium is restored?

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For $\text{N}_2\text{O}_4(g) \rightleftharpoons 2\,\text{NO}_2(g)$ , $K_p = 0.15\ \text{bar}$ at $298\ \text{K}$ . An equilibrium mixture of the two gases in a cylinder has a total pressure of $1.00\ \text{bar}$ . The piston is pushed in until the volume is halved, and the temperature is brought back to $298\ \text{K}$ . What is the partial pressure of $\text{NO}_2$ once equilibrium is restored?

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← Silver chromate, Ag₂CrO₄, is a red solid that dissolves only slightly in water: Ksp = 1.1 × 10⁻¹² at 298 K. What is its molar solubility at 298 K in a 0.010 mol L⁻¹ solution of potassium chromate, K₂CrO₄?Hydrochloric acid is diluted with pure water until its concentration is 5.0 × 10⁻⁸ mol L⁻¹. What is the pH of this solution at 298 K? Take Kw = 1.0 × 10⁻¹⁴ at 298 K, and remember that water itself ionises. →

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