Question

$\huge\pink{Question}$

Calculate the number of atoms in each of the following
a).52 moles of Ar
b).52 u of He.​

Answer 1

Answer:

(i) The number of atoms present in 52 mol of Ar are 52×6.023×10

23

=3.13×10

25

atoms.

(ii) 52 u of He will contain

4

52

=13 atoms.

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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

Hope it helps you