The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms?

# The number of atoms present in one mole of an element is equal to Avogadro number. Which of the following element contains the greatest number of atoms?

1. A

4 g He

2. B

46 g Na

3. C

0.4 g Ca

4. D

12 g He

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### Solution:

(a) 1 mol of He = 4 g = NA atoms
or 4 g of He
(b) 1 mole of Na = 23 g = NA atoms

(c) 1 mole of Ca = 40 g = NA atoms

= 0.01 NA atoms
(d) 1 mole of He = 4 g = NA atoms

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