Chemistry

Chemistry

Problem

Four different elementary gas-phase reactions occur at the same temperature and have the following characteristics. For each reaction, the probability that a given collision has the required orientation is listed. 1. Ea=50 kJ mol−1E_a = 50\,\text{kJ}\,\text{mol}^{-1}; correct orientation occurs in 1 of every 10 collisions 2. Ea=80 kJ mol−1E_a = 80\,\text{kJ}\,\text{mol}^{-1}; correct orientation occurs in 1 of every 2 collisions 3. Ea=60 kJ mol−1E_a = 60\,\text{kJ}\,\text{mol}^{-1}; correct orientation occurs in 1 of every 5 collisions 4. Ea=40 kJ mol−1E_a = 40\,\text{kJ}\,\text{mol}^{-1}; correct orientation occurs in 1 of every 50 collisions Assuming all reactions have the same overall collision frequency, which ranking from fastest to slowest reaction rate is most reasonable? a) 2 > 3 > 1 > 4 b) 1 > 3 > 4 > 2 c) 4 > 1 > 3 > 2 d) 4 > 3 > 1 > 2

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