Question

calculate the number of atoms present in one litre of water (density of water is 1g /mL)​

Answer 1

The liter of water has 1000 grams. The number of moles is 1000/18 = 55.556 moles.

The number of molecules is therefore 6.022*1023 * 55.556 = 3.346*1025 molecules.

The number of atoms is 3 times larger because each molecule has three atoms,

so there are 1.0038*1026 atoms in a liter of water.

Answer 2

your answer is in the picture

hope it helps you