
(a)
Interpretation:
The rate constant of the zeroth-order reaction has to be calculated.
Concept introduction:
Integrated law for zero-order reactions:
Consider a reaction,
Then, the rate of the reaction is
The expression for this reaction can be written as,
According to this law, the rate would not change with change in concentration.
The relationship between concentration and time for a reaction that is zero-order is given as,
(a)

Explanation of Solution
Rate constant for given zero order reaction,
Integration the above equation,
At time
From equation (1)
This equation is zero order reaction, and given values is substituted for this equation and calculates ‘k’
Therefore, the rate constant value is
(b)
Interpretation:
The time taken for the disappearance of all ammonia has to be found.
Concept introduction:
Rate of a reaction: It represents the speed at which a
Rate of reaction depends on time, temperature, pressure, concentration, and
Rate of the reaction is the change in the concentration of reactant or a product with time. It can be varied in accordance with temperature, pressure, concentration, presence of catalyst, surface area…
General rate reaction is,
The negative sign indicates the reduction of concentration of reactant.
(b)

Explanation of Solution
Integrated rate equation for zero order reaction,
Hence,
When all ammonia is consumed (or) disappears is
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Chapter 6 Solutions
Elements Of Physical Chemistry
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