A flask contains 0.280 mol of liquid bromine, br2. Determine the number of bromine molecules present in the flask.

1.68 * 10²³ Molecules

Explanation:

As we know that 1 mole of any substance contains exactly 6.022 * 10²³ particles which is also called as Avogadro's Number. So in order to calculate the number of particles (molecules) contained by 0.280 moles of Br₂, we will use following relation,

Moles = Number of Molecules : 6.022 * 10²³ Molecules. mol⁻¹

Solving for Number of Molecules,

Number of Molecules = Moles * 6.022 * 10²³ Molecules. mol⁻¹

Putting values,

Number of Molecules = 0.280 mol * 6.022 * 10²³ Molecules. mol⁻¹

Number of Molecules = 1.68 * 10²³ Molecules

Hence,

There are 1.68 * 10²³ Molecules present in 0.280 moles of Br₂.