For the reaction Cu + 2HCl = 2CuCl + H2, the standard change in the Gibbs energy is determined by the equation ∆G = 43060-58.35T (J). Determine the composition of the equilibrium gas phase at a total pressure of p = 0.5 atm. And T = 671 K, if at the initial moment 2 moles of H2 and HCl were mixed.

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