Question

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

Answer 1

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

Answer 2

Answer:  $2.05\times 10^{23}$ molecules

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

1 mole of $Br_2$ contains = $6.023\times 10^{23}$ molecules of bromine

0.340 mole of $Br_2$ contains = $\frac{6.023\times 10^{23}}{1}\times 0.340=2.05\times 10^{23}$ molecules of bromine

Thus there are $2.05\times 10^{23}$ molecules of bromine present in the flask.