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Problem 159b
Consider the sublimation of mothballs at 27 °C in a room having dimensions 8.0 ft ⨉ 10.0 ft ⨉ 8.0 ft. Assume that the mothballs are pure solid naphthalene (density 1.16 g/cm3) and that they are spheres with a diameter of 12.0 mm. The equilibrium constant Kc for the sublimation of naphthalene is 5.40⨉10-6 at 27 °C. C10H8(s) ⇌ C10H8(g) (b) How many mothballs are required to saturate the room with gaseous naphthalene?
- Ozone is unstable with respect to decomposition to ordi-nary oxygen: 2 O31g2 ∆ 3 O21g2 Kp = 1.3 * 1057 How many O3 molecules are present at equilibrium in 10 mil-lion cubic meters of air at 25 °C and 720 mm Hg pressure?
Problem 160
- The equilibrium constant for the dimerization of acetic acid in benzene solution is 1.51 * 102 at 25 °C. 2 CH3CO2H ∆ 1CH3CO2H22 Kc = 1.51 * 102 at 25 °C (b) What is the osmotic pressure of the solution at 25 °C?
Problem 161
Problem 162a
For the decomposition reaction PCl5(g) ⇌ PCl3(g) + Cl2(g), Kp = 381 at 600 K and Kc = 46.9 at 700 K. (a) Is the reaction endothermic or exothermic? Explain. Does your answer agree with what you would predict based on bond energies?
Problem 162b
For the decomposition reaction PCl5(g) ⇌ PCl3(g) + Cl2(g), Kp = 381 at 600 K and Kc = 46.9 at 700 K. (b) If 1.25 g of PCl5 is introduced into an evacuated 0.500-L flask at 700 K and the decomposition reaction is allowed to reach equilibrium, what percent of the PCl5 will decompose and what will be the total pressure in the flask?