Question

How many atoms of He are present in 52u of He??

Answer 1

Answer:

Atomic mass of He is 4u

one mole of He have mass = 4u

number of moles in 52 u of He = 52/4 = 13 moles

1 mole =6.022×10^23 atoms

in 13 moles, number of atom:

=13× 6.022×10^23

=78.286 × 10^23

=7.8286 × 10^24.

In 52 u of He 7.8286 × 10^24 atoms are present.

Answer 2

Answer:

Hey mate..

Explanation:

atomic mass of He is 4u

one mole of He have mass = 4u

number of moles in 52 u of He = 52/4 = 13 moles

1 mole =6.022×10^23 atoms

in 13 moles, number of atom:

=13× 6.022×10^23

=78.286 × 10^23

=7.8286 × 10^24.

In 52 u of He 7.8286 × 10^24 atoms are present.

Hope this will helps you