How many grams of gold are there in 0.209 moles of gold?

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.

How many valence electrons are in atom of radon?

How can a mixture of salt water be separated into salt and water