Question

One atom of an element weighs $6.644\times {10}^{-23}g$. Calculate the number of gram atoms in 40 kg of it.

Answer 1

Atomic mass of the element $=Massofoneatom\times 6.02\times {10}^{23}$

$=6.644\times {10}^{-23}\times 6.02\times {10}^{23}=40g$

No. of gram atoms $=\frac{Massoftheelementingrams}{No.ofgram}$

$=\frac{40000}{40}=1000$