Rate orders and Molecularity of a reaction

In the previous example we calculated the rate order to be 1.5. This probably looks very strange, since in all examples before the rate orders were whole numbers. But clearly a rate order does not have to be an integer munber  

Rate orders are defined as a mathematical way of linking rates to concentrations. 

Very often people confuse rate orders with what is called the Molecularity of a Reaction . This expression makes a statement of how many molecules interact in a reaction during the slowest (rate- 

Molecularity is defined as the number of molecules that react in a specific process. 

A reaction is said to be mono-molecular, if only 1 molecule is involved, e.g. 

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