# CHEM 0120 Exam 1 practice with answers

Feb 3rd, 2012
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General review of concepts in kinetics and equilibrium

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KINETICS1.) Consider the following reaction At 298 K the following data was collected a) What is the order of this reaction with respect to: P4 ______0________H2 ______1________Overall______1________b) Write the rate law for this reaction c) Determine the value and units of the rate constant, k, at 298 K. Using data from trial 1: => d) Relate the rates of formation of H2 and PH3. e) Given that the rate doubles when the temperature is increased by 10 K, what is the activation energy of this reaction? f) If you start this reaction with [H2] = 1.30 M and excess P4, what will [H2] be after 2 minutes? 1st order with respect to H2 g) If you start this reaction with [P4] = 0.500 M and excess H2, how long will it take for all of the P4 to react? 0th order with respect to P4 EQUILIBRIUM 2.) A common method of producing ammonia commercially is the Haber process a) At 300 oC, Kp for this reaction is . What is the equilibrium constant, Kc, at this temperature? What is Kc for the reverse reaction at this temperature?b) If a mixture is prepared with [N2] = 1.25 M, [H2] = 1.85 M and [NH3] = 2.25 M, in which direction will

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