For the first order reaction , 1 mole of reactant A gives 0.2 moles of B after 100 minutes. The half life of the reaction is min. (Round off to the nearest integer).

[Use: , ; Properties of logarith

Question

For the first order reaction , 1 mole of reactant A gives 0.2 moles of B after 100 minutes. The half life of the reaction is  min. (Round off to the nearest integer).

[Use: , ; Properties of logarithms: ; ]

Canvas Classes · Accepted Answer

: 1 mol A gives 0.2 mol B after 100 min.

Since 1 mol A gives 2 mol B at complete reaction, 0.2 mol B corresponds to 0.1 mol A reacted.

Remaining A =  mol (taking initial as 1 mol).

For first order:

Answer: 655 min

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