We can also use the equation for enthalpy change for physical phase changes. consider the phase change h2o(l) → h2o(g). calculate δhrxn.
use δhf values from the table above.
δhrxn =

Here’s one way to follow the scientific method. place the missing steps in the correct position in the process

The molality of calcium chloride (cacl2) in an aqueous solution is 2.46 m. what is mole fraction of the solute?

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?