The rate constant for this first-order reaction is 0.0265 s − 1 at 300 °C. A ⟶ products If the initial mass of A is 16.74 g, calculate the mass of A remaining after 1.27 min.

Answer : The mass of A remaining after 1.27 min is, 13.7 grams

Explanation :

Expression for rate law for first order kinetics is given by:

where,

k = rate constant  =

t = time passed by the sample  = 1.27 min = 76.2 s   (1 min = 60 s)

a =  initial amount of the reactant  = 16.74 g

a - x = amount left after decay process = ?

Now put all the given values in above equation, we get

Therefore, the mass of A remaining after 1.27 min is, 13.7 grams

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