Hello Haris,
Here is the answer to your question. Weight of 1 atom = 6.4*10^-23 g.
No. of atoms in 30 kg.
= 30*10^3/6.4*10^-23
= 4.658*10^26 atoms
1 gram atom = no. atoms in one mole = 6.02*10^23
no. of gram atom = 4.658*10^26/6.02*10^23
= 773.75-gram atoms.
Hope this helps.
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile