Answer: The number of atoms in given mass of lithium element is [tex]85.03\times 10^{23}[/tex]
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Mass of lithium = 97.9 g
Molar mass of lithium = 6.94 g/mol
Putting values in above equation, we get:
[tex]\text{Moles of lithium}=\frac{97.9g}{6.94g/mol}=14.12moles[/tex]
According to mole concept:
1 mole of an element contains [tex]6.022\times 10^{23}[/tex] number of atoms
So, 14.12 moles of lithium will contain = [tex]14.12\times 6.022\times 10^{23}=85.03\times 10^{23}[/tex] number of atoms.
Hence, the number of atoms in given mass of lithium element is [tex]85.03\times 10^{23}[/tex]
