Question

If you take 5 moles of carbon atoms in a container and your friend take 5 moles of sodium atoms in another container of same weight (a) whose container will be heavier

Answer 1

Mass of sodium atoms carried by your friend = (5 X 23) g = 115 g

Mass of carbon atoms carried by you = (5 x 12) g = 60 g

Thus, your friend's container is heavier.

Answer 2

Mol of a substance =atomic Wt.expressed in gms.

1mol.of C=12g &1 mol.of Na=23g

5mol.of C=60 g &5 mol of Na=115g

hence Rani container is heavier

one mole of any substance always has 6.023×10^23 atoms so 5 moles=30×10^23 atoms of both C and Na same no.of atoms 



hope its helps