Question

How many atoms of Ba would be equal to 11.3 g of Ba?

Answer 1

4.96 x 10²²atoms

Step-by-step explanation:

Given parameters

Mass of Ba = 11.3g

Unknown:

Number of atoms = ?

Solution:

To solve this problem, we need to find the number of moles of Ba first and then the number of atoms it contains.

Number of moles =
`(mass)/(molar mass)`

Molar mass of Ba = 137.3g/mol

Number of moles =
`(11.3)/(137.3)` = 0.08mole

1 mole of a substance contains 6.02 x 10²³ atoms

0.08 mole of Ba will contain 0.08 x 6.02 x 10²³ atoms = 4.96 x 10²²atoms