# Part A A flask contains 0.170 mol of liquid bromine, Br2. Determine the number of bromine...

## Question:

Part A

A flask contains 0.170 mol of liquid bromine, Br2. Determine the number of bromine molecules present in the flask.

Express your answer numerically in molecules.

## Moles and number of molecules :

Number of moles are given as :

{eq}n = \dfrac{Molecules_{given}}{N_{A}} {/eq}

where {eq}N_{A} {/eq} is the Avogadro number .

The units of number of moles is mol .

## Answer and Explanation:

Given : number of moles = 0.170 mol

To calculate : number of molecules

Number of molecules = {eq}\dfrac{0.170}{6.022\times 10^{23}} molecules {/eq}

this gives {eq}1.0237\times 10^{23} molecules {/eq}

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