Select the substance with the weakest dispersion force from each of the following pairs. 1) BF3 or BCl3 [a] 2) CH3CH3 or CH3CH2CH2CH3 [b] 3) CCl4 or CF4 [c]

25.5 grams of KNO3 (molar mass 101.1 g/mole) is dissolved in 250. grams of water. 1) What is the percent by mass of KNO3 (aq)? 2) What is the molality of the solution? Show all of your set up and work for credit, use units and correct number of significant figures.

Octane has a vapor pressure of 40. torr at 318.3 K  and 400. torr at 377.2 K. What is its heat of vaporization? You must show all of your work including units for credit.

What is the freezing point of a solution of 9.25 g of I2 (253.80 g/mol) in 50.0 g of benzene? (Freezing point of benzene = 5.5 oC, Kf for benzene = 5.12 oC/m) 

How many grams of ethanol (C2H5OH) can be vaporized at its boiling point by 525 kJ of heat? (∆Hvap of ethanol is 38.56 kJ/mol, molar mass of ethanol = 46.068 g/mol) Show all your work and setup for credit.

Liquid sodium can be used as a heat transfer fluid. Its vapor pressure is 40.0 torr at 906.2 K and 400.0 torr at 1096.2 K. Calculate its heat of vaporization. You must show all of your work including units for credit.

How much heat (in J), is necessary when 54.0 g of ice at 

Select the strongest intermolecular force in each of the following. 1) Cl2 – [a] 2) C2H6 – [b] 3) NF3 – [c] 4) BF3 – [d] 5) CH3Cl – [e]

What abnormal blood cell morphology is associated with the McLeod phenotype?

What is the freezing point of a solution of 7.25 g of I2 (253.80 g/mol) in 50.0 g of benzene? (Freezing point of benzene = 5.5 oC, Kf for benzene = 5.12 oC/m)