What is meant by solvation?

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

Arrange the elements in order of increasing electronegativity. use the periodic table to you arrange the elements. p o k mg