For the reaction , 2HI(g) → H2(g) +  I2(g), the rate of change of HI is -0.45 M/s. What is the rate of appearance of I2 ?

Consider the following reaction, for which Kc = 0.0136 at 731 K 2HI(g) ⇌ H2(g) + I2(g) Which of the following statements is always true, regardless of the conditions (temperature, pressure, etc)?

Predict the ideal van’t Hoff factor (i) for NaNO3.

Which of the following acids is the weakest? The acid is followed by its Ka value.

Classify the following as Lewis acid or Lewis base. a) NBr3 [a] b) Cr3+ [b]

The first-order reaction A → B, has a rate constant of 8.00 s-1. How many seconds will it take for the concentration of A to decrease from 0.500 M to 0.200 M?

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

Which of the following set of acids and conjugate bases would buffer most effectively at pH = 4.75?

A reaction mixture contains 0.139 M I2, 0.0392 M Cl2, and 0.222 M ICl for the reaction shown below: I2(g) + Cl2(g) ⇌ 2ICl(g)              KC = 9.04 at 298 K Show all your work and setup for credit. A) Calculate QC for the reaction. B) Is the reaction at equilibrium? C) If the reaction is not at equilibrium, will it proceed to form more reactants or more product?

Given the following data, determine the rate law for the following reaction. 2A + B + 2C → products Experiment [A] [B] [C] Rate (M/s) 1 0.273 0.763 0.400 3.0 2 0.819 0.763 0.400 9.0 3 0.273 1.526 0.400 12.0 4 0.273 0.763 0.800 6.0