Calculating the equilibrium constant.

At 100 degrees celsius, the molarities of dinitrogen tetraoxide and nitrogen dioxide are as follows: [N204]=0.037mol/L and [NO2]=0.12mol/L What is the value of the equilibrium constant Kp?

Multiple choice question about the concentration of a reactant after a set number of half lives.

A first order reaction has a half-life of 1.34 x 10^-3 hours. If the initial concentration of the reactant is 8.00M, what is its concentration after 4 half-lives? a. 4.00M b. 2.00M c. 1.00M d. 0.50M e. 0.25M

Multiple choice question about half lives and rate constants.

What is the half-life for a first order reaction with a rate constant of 0.573s(to the negative 1)? a. 1.21s b. 0.827s c. 1.25s d. 0.278s e. 3.49s

Multiple choice question about the concentration after an elapsed amount of time given k, and initial concentrations.

For the decomposition of N2O5 at 340K, where k=5.8x10(exponent negative 3)seconds(exponent negative 1) Calculate the concentration after 5.00 minutes if the initial concentration is 0.320M. a. 0.291 b. 0.056 c. 0.184 d. 0.557 e. none of above

Calculating the initial concentration of a substance given k, time elapsed and final concentration.

For the first order reaction below, the concentration of A after 855 seconds is 0.321M. If k= 2.54x10(exponent negative 4) seconds(exponent negative 1), what was the initial concentration of A? A-->B rate=k[A]

Concentration

For the second order reaction below, the concentration of A after 125 seconds is 0.0722M. If k=9.11x10(exponent negative 2) seconds(exponent negative 1), what is the initial concentration of A? 2A-->B

Writing equilibrium expressions.

What is the correct equilibrium expression for the following reaction? 2NH3(g) <--> N2(g)+ 3H2(g)

Equilibrium

At 25 degrees Celsius, the decomposition of dinitrogen tetraoxide has an equilibrium constant(Kp) of 0.144. If the equilibrium pressure of nitrogen dioxide is 0.298 atm, what is the pressure of dinitrogen tetraoxide? a. 2.07atm b. 0.162atm c. 0.617atm d. 0.0128atm

Equilibrium

Hydrogen iodide can decompose into hydrogen and iodide gases. Kp for the reaction is 0.016. If 0.350 atm of Hl(g) is sealed in a flask, what would be the total pressure of the system when equilibrium is established? a. 0.258atm b. 0.279atm c. 0.350atm d. 0.385atm e. 0.412atm

Acids/Base

The pH of 0.750M sodium hypochlorite, NaClO, is 10.72. What is the pKb for this base?