Blog

The PNF technique, Replication, requires you to start in a shorted range and has no passive movement. 

@X@user.full_name@X@ @GMU: What is the boiling point elevation when 10.85 g of Co(NO3)3 (formula mass = 244.93 g/mol) is dissolved in 163.41 g H2O? The boiling point elevation constant is 0.5100 (°C*kg)/mol. Assume any salt is completely ionic!

@X@user.full_name@X@ @GMU: What is the activation energy (in kJ/mol) for the reaction below if the rate constants are 1.800e-4 s-1 at 477.00°C and 5.42e-4 s-1 at 496.62°C?Cyclopropane → Propene

@X@user.full_name@X@ @GMU: The following data was obtained by the method of initial rates. What is the rate law for the reaction of A with B to produce product? [A]o [B]o Rate, M/s 0.247 0.229 4.78e-7 0.481 0.229 4.78e-7 0.247 0.452 1.33e-6

@X@user.full_name@X@ @GMU: What is the solubility in g/L of Ar at a partial pressure of 215.7 torr, if the solubility at a partial pressure of 352.5 torr is 0.02779 g/L?

@X@user.full_name@X@ @GMU: Initially there were equilibrium concentrations of 0.3344 M A, 0.2118 M B, and 0.1961 M C. Which change will cause the equilibrium to shift from left to right if the reaction is endothermic? Use the reaction below.5A(aq) → 3 B(aq) +3 C(aq) K = 0.424

@X@user.full_name@X@ @GMU: Radioactive substances decay by first-order kinetics. How many days would be required for a sample containing phosphorus-32 to decrease to 59.86% of its initial activity? The half-life of phosphorus-32 is 1.42e1 days.

@X@user.full_name@X@ @GMU: What is the rate constant at -58.56°C for the reaction below if the rate constant is 1.08e9 M-1s-1 at -78.00°C and the activation energy is 11.90 kJ/mol?NO(g) + O3(g) → NO2(g) + O2(g)

@X@user.full_name@X@ @GMU: A mixture containing an initial concentration of 0.1587 M for H2 and 0.1421 M for I2 is allowed to come to equilibrium (see reaction below). What must be the equilibrium concentration of HI?H2(g) + I2(g) → 2HI(g) Kc = 48.7000

@X@user.full_name@X@ @GMU: Initially there were equilibrium concentrations of 0.1611 M A, 0.5000 M B, and 0.1611 M C. Which change will cause Qc to be greater than Kc? Use the reaction below.5A → 2 B +3 C Kc = 0.644