** H₂ + O2-> Balancing equations from a reaction
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Answer: Thus 3 half lives have taken place.
Explanation:
Expression for rate law for first order kinetics is given by:
where,
k = rate constant
t = age of sample
a = let initial amount of the reactant
a - x = amount left after decay process
a) for completion of half life:
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
Number of half lives =
Thus 3 half lives have taken place.