N2o5(g) → no3(g) + no2(g)
this reaction is 1st order with half-life = 18.0 seconds. how long will it take for 95% of a sample of n2o5(g) to react?

a. 42.2 seconds
b. 132 seconds
c. 109 seconds
d. 77.8 seconds
e. 158 seconds

It will take 77.8 seconds for 95% of sample to react

Explanation:

As the given reaction obeys 1st order therefore-

Where is the concentration of after "t" time, is the initial concentration of and is half life

Here, and

So,

or,

So, it will take 77.8 seconds for 95% of sample to react

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

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