The reaction has at

CHEMISTRY · Single correct · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

The reaction 2 HI(g)⇌H2(g)+I2(g)2\,\text{HI}(g) \rightleftharpoons \text{H}_2(g) + \text{I}_2(g) has ΔG∘=+2.60 kJ mol−1\Delta G^\circ = +2.60\,\text{kJ mol}^{-1} at 298 K298\,\text{K}. In a vessel at 298 K298\,\text{K} the partial pressures are PH2=1.0 atmP_{H_2} = 1.0\,\text{atm} and PI2=1.0 atmP_{I_2} = 1.0\,\text{atm}. What is the MINIMUM partial pressure of HI (in atm) required to make the forward reaction spontaneous under these conditions? (R=8.314 J mol−1 K−1R = 8.314\,\text{J mol}^{-1}\,\text{K}^{-1}) (a) 3.0 atm3.0\,\text{atm} (b) 1.7 atm1.7\,\text{atm} (c) 0.60 atm0.60\,\text{atm} (d) 0.35 atm0.35\,\text{atm}

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