The blank of an element is the average mass of all isotopes of that element

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.

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.

Which process describes vaporization that takes place below the surface of a liquid? condensation melting boiling evaporation