What is the strongest type of van der waals force that exists between molecules of water?

Acrystal that absorvd water from air is (blank)a. aqueousb. homogenousc. hygroscopicd. efflorescent

A2.5% (by mass) solution concentration signifies that there is a 2.5 % (by mass) solution concentration signifies that there is blank of solute in every 100 g of solution. of solute in every 100 g of solution

How many moles of water are created if 3 moles of hydrogen react completely with excess oxygen?