Question

How many moles of bromine (Br) atoms are in a sample of 2.03 × 1024 atoms?

Answer 1

Answer: The number of moles of bromine atoms in the given amount of sample is 3.37 moles.

Explanation:

According to mole concept:

1 mole of an element contains $6.022]times 10^{23}$ number of atoms

We are given:

Number of bromine atoms = $2.03\times 10^{24}$

As, $6.022]times 10^{23}$ atoms form 1 mole of an element.

So, $2.03\times 10^{24}$ atoms will form = $\frac{1}{6.022\times 10^{23}}\times 2.03\times 10^{24}=3.37moles$ of bromine element.

Hence, the number of moles of bromine atoms in the given amount of sample is 3.37 moles.

Answer 2

The mole is simply an Avogadros number of anything( in this case Br atoms)

The Avogadro number is 6.022 x 10^23.

So no of moles = No of atoms / 6.022 x 10^23 = 2.03 x 10^24 / 6.022 x 10^23 = 3.37 Moles.