Asample 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 data:

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.

level 4 to level 2 : ))