Question

Calculate the number of atoms in each of the following :

(i) 52 moles of Ar
(ii) 52 u of He
(iii) 52 g of He
​

Answer 1

Answer:

Please refer to the attachment.

Explanation:

Thank you.

Answer 2

Answer:

(i) 1 mole of Ar =6.022×10

23

atoms of Ar

52 mol of Ar=52×6.022×10

23

atoms of Ar

=3.131×10

25

atoms of Ar

(ii) Atomic mass of He = 4amu

Or

4amu is the mass of He atoms = 1

Therefore 52 amu is the mass of He atoms=0.25×52=13 atoms of He

(iii) Gram atomic mass of He = 4g

Or

4g of He contains =6.022×10

23

atoms

Therefore 52 g of He contains=

4×52

6.022×10

23

=7.83×10

24

atoms

Explanation:

I don't know how to give multiple thanks...