Question

A flask contains 0.340 mol of liquid bromine, br2. determine the number of bromine molecules present in the flask.

Answer 1

Answer:
`2.05* 10^(23)` molecules

Step-by-step explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number
`6.023* 10^(23)` of particles.

1 mole of
`Br_2` contains =
`6.023* 10^(23)` molecules of bromine

0.340 mole of
`Br_2` contains =
`(6.023* 10^(23))/(1)* 0.340=2.05* 10^(23)` molecules of bromine

Thus there are
`2.05* 10^(23)` molecules of bromine present in the flask.

Answer 2

Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We calculate as follows:

0.340 mol Br2 ( 6.022 x 10^23 molecules / mol ) = 2.05 x 10^23 molecules