What kind of ocean ecosystem did the author of this text ask questions about

What is the mass of 8 moles of sodium atoms

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

The solubility of barium nitrate is 9.02 g/100 g h2o at 20°c. a 15.2 g sample of barium nitrate is added to 200.0 g of water at 20°c. is the solution saturated, unsaturated, or supersaturated? a. unsaturated b. saturated c. supersaturated