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Following are values of Kp at different temperatures for the reaction, 2 SO2(g) + O2(g)2 SO3(g). At 800 K, Kp = 9.1×102; at 900 K, Kp = 4.2×101; at 1000 K, Kp = 3.2; at 1100 K, Kp = 0.39; and at 1170 K, Kp = 0.12. Construct a plot to determine Ho for this reaction.
The van't Hoff equation isso the slope of the ln Keq versus 1/T plot equals Ho/R.
The slope of the plot = 22700 so Ho = R×slope = (8.314)×(22700) = 189000 J/mol = 189 kJ/mol