Category: Uncategorized

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

Sulfuryl Chloride, SO2Cl2 decomposes in the gas phase according to first order kinetics. Determine half-life and the rate constant.SO2Cl2(g) → SO2(g) + Cl2(g)

@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.

@X@user.full_name@X@ @GMU: A mixture containing an initial concentration of 0.1942 M for H2 and 0.1665 M for Br2 is allowed to come to equilibrium (see reaction below). What must be the equilibrium concentration of HBr?H2(g) + Br2(g) → 2HBr(g) Kc = 1.42e3