Question

No. Of atoms in 46g of Na (sodium). (Atomic mass=23)

Answer 1

23g of Na contains
$6.022 \times 10 {}^{23}$
atoms
46g of Na contain
$12.044 \times 10 {}^{23}$
atoms.

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Answer 2

Hi there!

46g of Na atom:

Atomic mass of Na = 23u

Number of particles = Number of Moles x N

⇒(Given weight/ Gram atomic weight) x 6.023 x 10²³

=(46/23)x 6.023 x 10²³

=2x 6.023 x 10²³

⇒12.046 x 10²³ Na particles

∴ 46 g of Na contains 12.044 x 10²³ 

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