Question

How much time would it take to distribute one Avogadro number of wheat grains, if ${10}^{10}$ grains are distributed each second?

Answer 1

Avogadro's number is $6.023\times {10}^{23}$.
The time required to distribute $6.023\times {10}^{23}$ grains is $\frac{6.023\times {10}^{23}}{1\times {10}^{10}}sec=6.023\times {10}^{13}$ seconds.
Convert unit of time from seconds to years.
$\frac{6.023\times {10}^{13}}{3600\times 24\times 365}=1.9099\times {10}^6$years.

Note: 1 year is equal to $3600\times 24\times 365$ seconds.