Question

how many atoms in 120g Mg?(Mg=24)​

Answer 1

Given:-

•Mass of Mg (Magnesium) = 120g

•Atomic mass of Mg = 24u

To find:-

•Number of atoms in 120g Mg

Solution:-

•Avogadro number = 6.022×10²³

We know that molar mass is the atomic mass of an element in grams.

Thus,molar mass of Mg is 24g.

Firstly let's calculate the number of moles in 120g Mg.

Number of moles:-

= Given Mass/Molar mass

= 120/24

= 5 moles

Now-----

Number of atoms:-

= Number of moles×Avogadro number

= 5×6.022×10²³

= 30.11×10²³

= 3.011×10²⁴ atoms

Thus, 3.011×10²⁴atoms are there in 120g Mg.