2011-12-22 Lisgar exam practice - 1 For the reaction 3B(s 2C(aq > A(g 2F(aq 15g of B is reacted A calorimeter with 200.0 g of water is used to evaluate

# 2011-12-22 Lisgar exam practice - 1 For the reaction 3B(s...

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1) For the reaction 3B (s) + 2C (aq) —> A (g) + 2F (aq) , 15g of B is reacted. A calorimeter with 200.0 g of water is used to evaluate the reaction. The water temperature changes from 25.0 o C to 12.5 o C over the course of the reaction. The molar mass of B is 89.5 g/mol. a) write a thermochemical equation with an energy term for the reaction as balanced. b) write the balanced chemical equation with an associated ) H term. c) calculate the molar ) H term for substance B in this reaction. d) draw an energy diagram for this reaction as balanced. 2) Initial reaction rates for the reaction in question 1 are calculated starting from the given initial concentrations: [ B ] i (M) [ C ] i (M) Rate of production of A (M/s) 0.1 0.1 0.011 0.2 0.1 0.039 0.1 0.3 0.013 a) Write a rate law equation for this reaction b) Write a plausible rate limiting step for this reaction. c) Is the reaction in question 1 a plausible rate limiting step? Why? d) If a reaction A+2B —> C is a rate limiting step, what is its rate law expression?

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