Question

Molecules contained in a drop of water weighing 1.8 g

Answer 1

1 mole of water = 18 g

0.06 g = ------mole

= 0.06/18 = 3.33 X 10-3 mole of water

1 mole of water will have 6.022X1023 molecules of water

3.33 X 10-3 mole of water will have -------molecules of water

= 6.022X1023 X 3.33 X 10-3

= 2 X 1021 molecule of water

0.06g of water will have 2 X 1021molecules of water

Answer 2

18 g contains Avagadroas no of molecules
1.8. contains 6.023 X 10²³ / 18 * 1.8 = 6.023 X 10²² molecules