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MissPhiladelphia

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:  \(2.05\times 10^{23}\) 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.

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