Question

Calculate number of atoms present in 100u of He.
(A)50 Atom
(B)25 Atom
(C)100 Atom
(D)10 Atom​

Answer 1

Answer:

(B) 25 Atoms

Explanation:

Atomic mass of He = 4 u

mass of one He atom = 4 u

∴ No. of atoms in 100 u of He = 100/4 = 25 He atoms.