Question

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

a)52 moles of argon. b) 104 g of He​

Answer 1

Answer:

in the figure below ,find the value of x . A triangle on rigt side 7 cm on left side 2 cm and down side 24 cm L,M,N(

Explanation:

in the figure below ,find the value of x . A triangle on rigt side 7 cm on left side 2 cm and down side 24 cm L,M,N(

Answer 2

Answer:

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and cute

Explanation:

(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