A sample of dihydrogen dioxide (hydrogen peroxide) has a mass of 456.78 grams. How many molecules are there in the sample?

How many atoms are there?

80.7 * 10²³ molecules

It also contain the same number of atoms.

Explanation:

Given dа ta:

Mass of hydrogen peroxide = 456.78 g

Number of molecules = ?

Number of atoms = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms, ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 * 10²³ is called Avogadro number.

For example,

Number of moles = mass / molar mass

Number of moles = 456.78 g / 34 g/mol

Number of moles = 13.4 mol

one mole of hydrogen peroxide contain 6.022 * 10²³ molecules.

13.4 mol * 6.022 * 10²³ molecules / 1 mol

80.7 * 10²³ molecules

It also contain the same number of atoms.