Question

Based on knowledge of collisions and orientation factors for reactions, which of the following non-elementary reactions would be more likely to have the highest rate constant for a given temperature presuming all reactants are in equal concentrations?

• A. $N_2+3H_2\to 2N{H}_3$
• B. $NO+O_3\to N{O}_2+O_2$
• C. $2NO+O_2\to 2N{O}_2$
• D. $2H_2+O_2\to 2H_{2}O$

Answer 1

Answer: (A)

$N_2+3H_2\to 2N{H}_3$

Correct is A

The collision theory explains why reactions occur between atoms, ions, and/or molecules. With an increase in temperature, there is an increase in the number of collisions. Increasing the concentration of a reactant increases the frequency of collisions between reactants and will, therefore, increase the reaction rate. Hence, $N_2+3H_2\to 2N{H}_3$