Why is the movement of water between land, oceans and living things
important?

How many miles of water are produced if 5.43 mol pbo2 are consumed

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms

How many grams of mgbr2 are needed to produce 75g or metal?