Question

Calculate the number of molecules present in 36g of water and also find the number of atoms of EACH ELEMENT in it.?

Answer 1

Answer:

1 mole of H2O molecule = 18 grams.

2 moles of H2O molecule = 36 grams

But, 2 moles of H2O molecule contains 2 moles of H2 molecule and 1 mole of O2 molecule.

But, 2 moles of H2 molecule contain 4 moles of H atoms and 1 mole of O2 molecule contains 2 moles of O atom.

So finally,

2 moles of H2O molecule = 4 moles of H atom + 2 moles of O atom

= 4 X (6.023 X 10²³) + 2 X (6.023 X 10²³)

= 6 X (6.023 X 10²³)

= 36.138 X 10²³ atoms.