Question

Which has more number of atom 48g of magnesium or 69g of sodium.​

Answer 1

Moles of Mg =  

24

48

​  

=2

Number of atoms of Mg = Moles×Avogadro number = 2×6.023×10  

23

=12.04×10  

23.

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Answer 2

Answer:

69 g of Sodium (Na) has more number of atoms.

Explanation:

(1) Moles of Mg =

Mass ÷ Molar mass

= 48 ÷ 24

= 2 mol

Number of atoms of Mg =

Moles × Avogadro No

= 2 × 6.023 × 10 ^23

= 12.04 × 10^23 atoms

(2) Moles of Na =

Mass ÷ Molar mass

= 69 ÷ 23

= 3 mol

Number of atoms of Na =

Moles × Avogadro No.

= 3 × 6.023 × 10 ^23

= 18.07 × 10^23 atoms

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