A first order reaction: 
products and a second order reaction: 
Products both have half - time of 20 minutes when they are carried out taking 4 mole L-1 of there respective reactants. Number of mole per litre of A and R remaining unreacted after 60 minutes from the start of the reaction, respectively will be.
Text Solution
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In case of first order reaction t1/2 will remain constant independent of initial concentration so.
That is, after 60 minutes 0.5 mole L-1 of A will be left unreacted.
In case of second order reaction t1/2 is inversely proportional to initial concentration of reactant i.e., t1/2 will go on doubling as concentration of reactant will go on getting half. That is, t1/2a will be constant, so.
That is, after 60 min, the concentration of R remaining unreacted will be 1 mole L-1
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