Ncert Exercises & Solutions

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

Avagadro number = 6.02

\times 10^{23}

Thus, time required

= \frac{6.02 \times 10^{23}}{10^{10}} s

= 6.02 \times 10^{13} s

= \frac{6.02 \times 10^{13}}{60 \times 60 \times 24 \times 365} y e a r s

Hence, the time taken would be

1.909 \times 10^{6} y e a r s

.