Question

NUMBER OF ATOMS IN 104g OF He

Answer 1

Answer:-

1.565×10²⁶ molecules

Explanation:-

Given:-

→ Mass of Helium (He) = 104g

To find:-

→ Number of atoms

Solution:-

• Atomic mass of Helium (He) = 4u

Since, atomic mass of He is 4u, thus it's molar mass will be 4g/mol.

Firstly, let's calculate the number of moles in 104g of He.

No of moles = Given Mass/Molar mass

= 104/4

= 26 moles

• Avogadro Number = 6.022×10²³

No of atoms

= No of moles × Avogadro Number

= 26×6.022×10²³

= 156.572×10²³

= 1.565×10²⁶ atoms

Thus, 1.565×10²⁶ atoms are there.