What is the mass of 1.506 x 10^24 atoms of Argon

Mass = 99.875 g

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