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?