Question

Calculate the number of atoms of bromine in 1.37 g of bromine. Give your answer in scientific notation. Enter your answer in the provided box. x 10 (select)atoms Br

Answer 1

Answer: The number of atoms of bromine present in given number of mass is
`1.03* 10^(22)`

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}}`

Given mass of bromine = 1.37 g

Molar mass of bromine = 79.904 g/mol

Putting values in above equation, we get:

`\text{Moles of bromine}=(1.37g)/(79.904g/mol)=0.0171mol`

According to mole concept:

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

So, 0.0171 moles of bromine will contain =
`0.0171* 6.022* 10^(23)=1.03* 10^(22)` number of bromine atoms.

Hence, the number of atoms of bromine present in given number of mass is
`1.03* 10^(22)`