Select the strongest intermolecular force in each of the following. 1) Cl2 – 2) C2H6 – 3) NF3 – 4) BF3 – 5) CH3Cl –

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

Calculate the pH of a solution with a hydroxide ion concentration of 5.25 x 10-6 M at 25oC.

Calculate the pH of a buffer containing 2.50 M formic acid, HCOOH (Ka = 1.8 × 10-4) and 1.25 M sodium formate, HCOONa.You must show all of your work for credit.

Determine the Ka for CH3NH3+ at 25°C. The Kb for CH3NH2 is 4.4 × 10-4.

Given the following equation and equilibrium constant: 2H2(g) + S2(g)  ⇌ 2H2S(g)    K = 1.08 x 107 determine K for the following reaction H2S(g)  ⇌ H2(g)  + S2(g)  K = ?

Phosphorus pentachloride decomposes into phosphorus trichloride and chloring gas at 250oC. PCl5(g) ⇌ PCl3(g) + Cl2(g) If 0.98 M PCl5, 0.188 M PCl3 and 0.188 M Cl2 are present at equilibrium: Show all your work and setup for credit. A) Calculate KC for this reaction. B) Calculate KP for this reaction.

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) 

The half-life of a first-order reaction is 0.300 s. What is the rate constant?

What is the boiling point of a solution prepared by dissolving 320.0 g of S8 (molar mass = 256.5 g/mol) in 1500.0 g of CCl4? (Kb = 5.05oC/m, boiling point of pure CCl4 = 76.7oC)