physical final

• molecules in real gas encounter both repulsive and a attractive forces
• molecular size contributes to van der waals force coefficient b
• liquefaction of gas occurs because of intermolecular attraction
• a real gas below its critical temperature will liquefy
• vander waals equation can be written as a cubic equation in v
• density = m of one mole (kg)/ v of one mole (l/mol)
• Xa is NOT the mole fraction of substance a in the vapour phase
• Xa + Xa DOES NOT EQUAL 1
• The solution with the lowest boiling point elevation will have the lowest van't Hoff factor and/or the lowest molality of solute particles
• each translational and rotational mode contributes 1/2R to the heat capacity
• each vibrational mode contributes R to the heat capacity
• use the van't hoff factor (Vi) of the solute not the solvent
• a values of hte VDW equations relates to intermolecular interactions
• if coefficient a increase the pressure decreases
• in boyles law p and v are inversely proportional to each other
• when finding V using the ideal gas law the answer is given in m^3