Question

calculate number of atom in 9 gram of aluminium​

Answer 1

Answer:

Aluminum molecular mass = 26.982 grams.

This refers that 1 mole of aluminum is equal to 26.982 grams of aluminum.

Then, No. of moles in 9 grams of aluminum is determined by the ratio of the mass of aluminum to the atomic mass

of aluminum.

= 9/ 26.982 =

Moles of aluminum = 0.333 moles so, the No. of moles of atoms present in 9 grams of aluminium is 0.33 moles. This refers that one third of a moles of atoms is contained in 9 g of aluminum.

No. of atoms in 9 g of aluminum = No of moles x Avogadro number

= 0.33 X 6.028 X 10^23

No. of atoms in 9g of aluminum= 2.011 X 10^23 atoms