Question

How many atoms of hydrogen are in 210 g of hydrogen peroxide (h2o2)?

Answer 1

Number of hydrogen atoms =
`7.44* 10^(24)`

Step-by-step explanation:

Given,

Mass of
`H_2O_2` = 210 g

Molar mass of
`H_2O_2` = 34.0147 g/mol

The formula for the calculation of moles is shown below:

`moles = (Mass\ taken)/(Molar\ mass)`

Thus,

`Moles= (210\ g)/(34.0147\ g/mol)`

`Moles_(H_2O_2)= 6.1738\ mol`

From the formula of
`H_2O_2`,

1 mole of
`H_2O_2` contains 2 moles of hydrogen atoms

6.1738 moles of
`H_2O_2` contains 2*6.1738 moles of hydrogen atoms

Moles of hydrogen = 12.3476 mole

Avogadro constant:-
`N_a=6.023* 10^(23)\ mol^(-1)`

1 mole contains
`6.023* 10^(23)` atoms

12.3476 moles contains
`12.3476* 6.023* 10^(23)` atoms

Number of hydrogen atoms =
`7.44* 10^(24)`