Constants Periodic Table Part A Consider the reaction : X2(g) ? 2 x(g) When a ve

Question

Constants Periodic Table Part A Consider the reaction : X2(g) ? 2 x(g) When a vessel initially containing 786 torr of X2 comes to equilibrium at 298 K, the equilibrium partial pressure of X is 107 torr . The same reaction is repeated with an initial partial pressure of 704 torr of X2 at 739 K; the equilibrium partial pressure of X is 567 torr Find ??? for the reaction. Express your answer with the appropriate units. ???,-20.5 kJ / mol SubmitPrev X Incorrect; Try Again; 4 attempts remaining Previous Answers Request Answer

Explanation / Answer

Part A)

given,

P1 = 107 torr    T1 = 298 K

P2 = 567 torr    T2 = 739 K

R = gas constant

Using,

ln(P2/P1) = dHo/R[1/T1 - 1/T2]

ln(567/107) = dHo/8.314[1/298 - 1/739]

dHo = 6.923 kJ/mol

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