8. What is the mass of 2.31 x 1023 formula units of SrF2?

47.74 g

Explanation:

Given dа ta:

Formula units of SrF₂ = 2.31 * 0²³

Mass of SrF₂ = ?

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 formula units

2.31 * 0²³formula units * 1 mol / 6.022 * 10²³ formula units

0.38 mol

Mass of SrF₂:

Mass = number of moles * molar mass

Mass = 0.38 mol * 125.62 g/mol

Mass = 47.74 g