calculate the mass of 0.2 mole of water (O=16,H=1)
Given:
Number of moles = 0.2 moles
Molar mass of water = 18g
So, Mass = Molar mass * number of moles
= 18 * 0.2
3.6g
So, 0.2 moles of water contain 3.6g of water.
The mass of 0.5 moles of Water molecules is:
(Atomic mass, H =1; O = 16)