Question

how much time (in years) would it take to distribute one avogadro number of wheat grains if 10¹0 grains are distributed each second

Answer 1

We can solve it by unitary method.
10^10 grains are distributed in 1 second

6.022×10^23 grains are distributed in 6.022×10^23/ 10^10 seconds = 6.022 × 10^13 seconds.

Now 6.022× 10^13 seconds= 6.022×10^13 /( 3600 × 24 × 365)years ~ 1.9 × 10^6 years