Question

How many atoms are there in 3.5 moles of arsenic?

Answer 1

Hint: Arsenic is a chemical element represented by the symbol $As$ which have atomic number 33. It occurs in many minerals and it is kept under the category of metalloids. It is used as a n-type dopant in semiconductor devices.

Complete step by step answer:
- The mole is represented by the symbol mol. It is the unit of measurement for amounts in SI units where SI stands for International System units. A mole of substance or particles can be defined as containing exactly $6.02214076\times {{10}^{23}}$ particles and the particles may be atoms, ions or electrons. In short 1 mol contains $6.02214076\times {{10}^{23}}$ of the specified particles and these $6.02214076\times {{10}^{23}}$ is known as Avogadro’s constant.
- Atoms are made up of a nucleus where the nucleus consists of protons and neutrons inside it. Protons are positively charged ions whereas neutrons are neutral in charge i.e. it consists of no charge and outside the nucleus electrons are present in a simple manner we can say that electrons are revolving around the nucleus and these electrons are negatively charged ions. Hence an atom is made up of three particles called electrons, protons and neutrons and 1 mol exactly contains $6.02214076\times {{10}^{23}}$ atoms or particles.
We know that 1 mol of $As$ contains $6.02214076\times {{10}^{23}}$ atoms which can also be written as $6.023\times {{10}^{23}}$,
- Then 3.5 mol of $As$ contains $3.5\times 6.023\times {{10}^{23}}$ i.e. $21.077\times {{10}^{23}}$ atoms which can also be written as $2.11\times {{10}^{24}}$
Thus $2.11\times {{10}^{24}}$ atoms are present in 3.5 mol of arsenic.

Note: There are many uses of arsenic like mainly this is used in car batteries, due to its toxic nature towards insects, bacteria and fungi it is used as wood preservative and has many applications in the medicine industry and in alloys.