Question

Analyzing a specific reaction Consider the following reaction: 2Mg+O2→2MgO,rate=k[Mg][O2]2 Part A What is the overall reaction order? Express your answer as an integer.

Answer 1

The overall reaction order for the given reaction is 2.

Step-by-step explanation:

The overall reaction order of a chemical reaction is the sum of the individual reaction orders for each reactant. In this reaction, the rate law is given as rate=k[Mg][O2]^2. Since the reaction is first order in both Mg and O2, the overall reaction order is 1+1=2.

Answer 2

3

Step-by-step explanation:

Order of in the mass action law is the coefficient which is raised to the active concentration of the reactants. It is experimentally determined and can be zero, positive negative or fractional.

The order of the whole reaction is the sum of the order of each reactant which is raised to its power in the rate law.

Thus,

For the reaction:-

2Mg+O₂→2MgO

Rate = k[Mg][O₂]²

Order w.r.t. Mg = 1

Order w.r.t. O₂ = 2

So, order of the overall reaction = 1 + 2 = 3