How many moles of Ar is 2.53 x 1024 atoms of Ar?

4.2 moles of Ar

Explanation:

Given data:

Number of moles of Ar = ?

Number of atoms of Ar = 2.53 × 10²⁴

Solution:

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

2.53 × 10²⁴  atoms ×  1 mole  / 6.022 × 10²³ atoms

0.42 × 10¹ mole

4.2 moles

ch3 [ch2]14cooh

explanation:

pure substance: iron,copper

impure substance: water,charcoal