Question

How many moles of water, H2O, contain 2.0×1022 molecules of water? (See the hints for assistance in interpreting scientific notation.)

Answer 1

Avogadro Number of molecules is contained in 1 mole of water

6.02 * 10²³ molecules are contained in 1 mole of water.

2 * 10²² molecules will contain: (1* 2 * 10²²) / (6.02 * 10²³)

≈ 0.0332 mole of Water.