Answer:
Mass = 99.875 g
Step-by-step explanation:
Given data:
Number of atoms of Ar = 1.506× 10²⁴
Mass in gram = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
1.506× 10²⁴ atoms × 1 mol / 6.022 × 10²³ atoms
0.25× 10¹ mol
2.5 mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 2.5 mol × 39.95 g/mol
Mass = 99.875 g