A student, Jen is measuring the standard reaction enthalpy a reaction using van't Hoff equation: 2A (g) <==> B (g) + C (g) at the standard pressure 1 bar. Where A, B, C are the chemicals she knows and measures their partial pressures. She then plots the equillibirum constant of the reaction between 300 K and 600 K. She first fits the data using an empiricial equation shown below: ln(Keq) = -0.85+-280/T + 0.2/T2 where the unit of the temperature T is K and the units of the rest parameters are accordingly to make the total equation unitless. Then she uses the van't Hoff equation and the fitted curve to calculate the reaction enthalpy at 517.7 K. ΔrH = ________ J/mol. 3 sig. fig. Gas constant R = 8.3145 J/mol/K.
A student, Jen is measuring the standard reaction enthalpy a reaction using van't Hoff equation:
2A (g) <==> B (g) + C (g)
at the standard pressure 1 bar. Where A, B, C are the chemicals she knows and measures their partial pressures. She then plots the equillibirum constant of the reaction between 300 K and 600 K.
She first fits the data using an empiricial equation shown below:
ln(Keq) = -0.85+-280/T + 0.2/T2 where the unit of the temperature T is K and the units of the rest parameters are accordingly to make the total equation unitless.
Then she uses the van't Hoff equation and the fitted curve to calculate the reaction enthalpy at 517.7 K. ΔrH = ________ J/mol. 3 sig. fig. Gas constant R = 8.3145 J/mol/K.
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