Question

Q.9)Calculate the number of atoms in each of the following

a)52 moles of argon. b) 104 g of Hel​

Answer 1

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

2)

Since mass of one atom of He=4a.m.u

Therefore the number of atoms of the He in 104amu is,

4

104

=26.

Answer 2

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a)52 moles of argon:

The number of atoms present in 52 mol of Ar are

$</u><u>52 \times 6.023 \times {10}^{23}$

$</u><u>3.13 \times {10}^{23}$

b)104 g of He

The number of atoms present in 104 g of He

$</u><u>26 \times 6.023 \times {10}^{23}$

$</u><u>156 \times{10}^{23}$

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