Question

How many $Li$ atoms are in 5.8 moles of $Li$?

Answer 1

An atom is the smallest unit of matter which forms a chemical element. Matter is anything which occupies space and has definite mass. Matter exists in three states which are known as states of matter; these are known as solid, liquid and gas.

Complete step-by-step answer: Mole is generally represented by the symbol mol. It is generally described as the unit of measurement for the amount of substance in SI where SI stands for International System of units. It is defined on the basis of Avogadro’s number. A mole of a substance or particle can be defined as containing exactly $6.02214076\times {{10}^{23}}$ particles which may be atoms, molecules or ions where $6.02214076\times {{10}^{23}}$ is known as the Avogadro’s number.
Every atom is composed of a nucleus and this nucleus is made up of protons and neutrons where protons are positively charged and neutrons are neutral in charge and electrons which are positively charged are revolving around the nucleus.
Now we know that one mole of any molecule contains exactly $6.02214076\times {{10}^{23}}$ atoms then we can easily calculate by number of atoms in lithium molecule by dividing the Avogadro’s number by the given number of moles which can be shown as follows:
$6.022\times {{10}^{23}}\times 5.8=3.49\times {{10}^{24}}$ $Li$ atoms.
Hence we can say that $3.49\times {{10}^{24}}$ $Li$ atoms are in 5.8 moles of $Li$.

Note: Avogadro’s number basically tells us about the number of particles present in one mole of the substance. These particles can be electrons, molecules or atoms. It can also be known by the name Avogadro’s constant which has a fixed value of $6.02214076\times {{10}^{23}}$.