First order reaction

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First order reaction:

The reaction in which the rate of the reaction depends on the concentration of one reacting species is called a first order reaction. 

Example:

(1) Decomposition of nitrogen pentoxide in CCl⁴ solution
                                     1
N²O⁵ -CCl⁴-> 2NO² + --- O², rate = k[N²O⁵]

(2) Decomposition of ammonia nitrite in aqueous solution

NH⁴NO² ---> N² + 2H²O, rate = k[NH⁴NO²]

(3) Decomposition of hydrogen peroxide in the presence of pt catalyst 
                               1
H²O² -Pt-> H²O + ---   O², rate = k[H²O²] 

(4) Hydrolysis of methyl acetate in aqueous solution 

CH²COOCH³ + H²O --H+--> CH3OOH + CH³OH 

(5) Inversion of Cane sugar 

C¹²H²²O¹¹ + H²O --H+--> C⁶H¹²O⁶+H²O

Note: In the example 4 and 5, the concentration of H²O does not change as it's concentration is very high, i.e, 55.5mm                     

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