Author: Anonymous

@X@user.full_name@X@ @GMU: It took 286.6 s for 35.22% of a substance to react according to first-order kinetics. What is the value of the rate constant?

What would be the expected rate law for the mechanism described below?1 CH3CH2Br + AlBr3 → AlBr4- + CH3CH2+ slow 2 CH3CH2+ + C6H6 → C6H6CH2CH3+ fast 3 C6H6CH2CH3+ + AlBr4- → AlBr3 + HBr + C6H6CH2CH3 fast

John Schreifels @GMU: Which substance in the reaction mechanism below is an intermediate?(1) A + B → C + D(2) D + E → F

@X@user.full_name@X@ @GMU: What is the overall order of the elementary reaction:2*A + 3*B → C?

@X@user.full_name@X@ @GMU: When 7.856 g of aspirin was dissolved in 109.4 g of benzene, the freezing point was 276.6 K. What is the formula mass of this compound? The freezing point depression constant for benzene is 5.12 (°C*kg)/mol. The melting point and boiling points are 5.50°C and 80.10°C, respectively.

@X@user.full_name@X@ @GMU: The osmotic pressure of an unknown solution is 0.772 atm at 9.96 °C. Which of the solutions below is the most likely one? Assume any salt is completely ionic!

@X@user.full_name@X@ @GMU: Initially there were equilibrium concentrations of 0.1766 M A, 0.2500 M B, and 0.1766 M C. Which change will cause Qc to be greater than Kc? Use the reaction below.3A → 4 B +3 C Kc = 0.804

@X@user.full_name@X@ @GMU: Initially there were equilibrium concentrations of 0.1639 M A, 0.5000 M B, and 0.1639 M C. Which change will cause the equilibrium to shift from right to left? Use the reaction below.6A → 2 B +3 C Kc = 0.517

@X@user.full_name@X@ @GMU: What is the order for reactant A (first) and B from the initial concentrations and reaction rates below? [A]o [B]o Rate, M/s 0.275 0.376 5.89e-7 0.504 0.376 1.08e-6 0.275 0.631 7.64e-7

@X@user.full_name@X@ @GMU: The osmotic pressure of a 19.902 mM solution of Ba(NO3)2 is 802.229 mm Hg at 13.70 °C. How many ions per formula unit of Ba(NO3)2 must there be? The compound may not be completely ionic.