At 298 K, the standard Gibbs energies of formation are NO₂(g) +51.3 kJ mol⁻¹ and N₂O₄(g) +97.9 kJ mol⁻¹. A vessel at 298 K holds N₂O₄ at 0.90 bar and NO₂ at 0.15 bar. For N₂O₄(g) ⇌ 2 NO₂(g) in this mixture, which statement is correct? Take R = 8.314 J K⁻¹ mol⁻¹.

ChemistryAdvancedHigh School (11–12)Chemical Reactions JEE Advanced

At $298\ \text{K}$ , the standard Gibbs energies of formation are $\text{NO}_2(g)$ $+51.3\ \text{kJ mol}^{-1}$ and $\text{N}_2\text{O}_4(g)$ $+97.9\ \text{kJ mol}^{-1}$ . A vessel at $298\ \text{K}$ holds $\text{N}_2\text{O}_4$ at $0.90\ \text{bar}$ and $\text{NO}_2$ at $0.15\ \text{bar}$ . For $\text{N}_2\text{O}_4(g) \rightleftharpoons 2\,\text{NO}_2(g)$ in this mixture, which statement is correct? Take $R = 8.314\ \text{J K}^{-1}\ \text{mol}^{-1}$ .

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← A solution at 298 K contains 0.010 mol L⁻¹ each of Cu²⁺ and Fe²⁺, and 0.30 mol L⁻¹ hydrochloric acid. It is saturated with hydrogen sulfide, so that [H₂S] = 0.10 mol L⁻¹. For H₂S, K_a1 = 9.1 × 10⁻⁸ and K_a2 = 1.2 × 10⁻¹³. Take Ksp(CuS) = 6.3 × 10⁻³⁶ and Ksp(FeS) = 6.3 × 10⁻¹⁸. Which of the following statements are correct?A solution at 298 K contains benzoic acid at 0.10 mol L⁻¹ (Ka = 6.4 × 10⁻⁵) and acetic acid at 0.20 mol L⁻¹ (Ka = 1.8 × 10⁻⁵). Both acids are weak, and each is only slightly ionised. What is the pH of the solution? →

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