Question

How many Li atoms are contained in 97.9 g of Li

Answer 1

Answer: The number of atoms in given mass of lithium element is
`85.03* 10^(23)`

Step-by-step explanation:

To calculate the number of moles, we use the equation:

`\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}`

Mass of lithium = 97.9 g

Molar mass of lithium = 6.94 g/mol

Putting values in above equation, we get:

`\text{Moles of lithium}=(97.9g)/(6.94g/mol)=14.12moles`

According to mole concept:

1 mole of an element contains
`6.022* 10^(23)` number of atoms

So, 14.12 moles of lithium will contain =
`14.12* 6.022* 10^(23)=85.03* 10^(23)` number of atoms.

Hence, the number of atoms in given mass of lithium element is
`85.03* 10^(23)`