A large sample of iron fillings has a mass of 102 grams. how many iron atoms are there

11 * 10²³ atoms

Explanation:

The given problem will be solved through the Avogadro number.

It is the number of atoms, ions or molecules in one gram of an atom of elements or in one gram ions of a substance or one gram molecules of compound.

The number 6.022 * 10²³ is called Avogadro number.

For example:

18 g of water = 1 mole of water = 6.022 * 10²³ molecules of water

23 g of sodium = 1 mole of sodium = 6.022 * 10²³ atoms of sodium

Given dа ta:

Mass of iron = 102 g

Atoms of iron = ?

Solution:

55.845 g of iron = one mole of iron = 6.022 * 10²³ atoms of iron

For 102 g:

102 g / 55.845 g * 6.022 * 10²³ atoms = 11 * 10²³ atoms