Calculating equilibrium concentrations when the net reaction proceeds in reverse Consider mixture C, which will cause the net reaction to proceed in reverse. + net Concentration (M) [XY] [X] + [Y] initial: 0.200 0.300 0.300 change: equilibrium: 0.200+x 0.300 – x 0.300 – x The change in concentration, x, is positive for the reactants because they are produced and negative for the products becaus they are consumed. Part C Based on a K, value of 0.170 and the data table given, what are the equilibrium concentrations of XY, X, and Y, respectively?

10. Initially a 1.0 L vessel contains 10.0 mol of NO and 6.0 mol of O2 at a certain temperature. 2 NO (g) + O2 (g) = 2 NO2 (g)

Given the following initial partial pressures, what is the equilibrium concentration of SO3 (e)? SO2 () + NO2 (s) SO3 () + NO (g) K, = 3.75 (at the current temperature) Initial Species Pgas (atm) SO2 0.277 NO2 0.226 SO3 0.756 NO 0.878 IMPORTANT: When entering your answer: • Enter the number only (no units) Do not leave any spaces • Use a leading zero before the decimal when necessary Report your number to 3 decimal places (regardless of the significant figures) • Correctly round your answer to the 3rd decimal place (allowed margin of error is only ± 0.001, so always use un- rounded numbers in your calculations) Examples: 0.123 or 9.876

At a certain temperature, 0.780 mol SO3 is placed in a 3.50 L container.   2SO3(g)↽−−⇀2SO2(g)+O2(g)   At equilibrium, 0.120 mol  O2 is present. Calculate ?c.

0. For the following equilibrium in an enclosed system, how many degrees of freedom are there? Suggest a variable or set of variables to serve as these deare of reedom. high temp 2 NAHCO3(s) Na2CO3(s) + H20(g) + CO2(g)

Consider the following reaction: NO(g) + SO3(g) = NO2(g) + SO2(g) A reaction mixture initially contains 0.639 M NO and 0.639 M SO3. Determine the equilibrium concentration of NO2 if K, for the reaction at this temperature is 0.0118. Enter the numerical value to three decimal places without units. Answer:

Write the expression for the equilibrium constant K, for the following reaction. (Enclose pressures in parentheses and do NOT write the chemical formula as a subscript. For example, enter (PNH)2 as (P NH3)². If either the numerator or denominator is 1, please enter 1.) PCI5(g) + PCI3(g) + Cl2(g) K ||