Question

calculate the number of atoms in Ne -22 of mass 12.55 g​

Answer 1

Answer:

Number of atoms in 12.55 g of Ne-22 = 3.43 X 10²³ atoms

Explanation:

Given

Mass of Ne-22 = 12.55 g

Number of atoms in 12.55 g of Ne-22 = ??

Solution

Atomic mass of Ne-22 = 22 g/mol

Avogadro's number = 6.022 X 10²³ atoms/ mol  

first need to calculate number of moles

No. of Moles = Given mass/ Atomic mass

No. of Moles = 12.55/ 22

No. of Moles = 0.57 mol

Number of atoms

Number of atoms in 12.55 g of Ne-22 = No. of Moles of Ne-22 X Avogadro's number

Number of atoms in 12.55 g of Ne-22 = 0.57 mol X 6.022 X 10²³ atoms/ mol\

Number of atoms in 12.55 g of Ne-22 = 3.43 X 10²³ atoms