For the reaction. PCl_5 PCl_3 + Cl_2, K_c = 33.3 @ 1033 K. [PCl_3] = 0.020 [Cl_2

Question

For the reaction. PCl_5 PCl_3 + Cl_2, K_c = 33.3 @ 1033 K. [PCl_3] = 0.020 [Cl_2] = 0.30, and [PCl_] = 4.00 times 10^-3. Given these concentrations which direction must the reaction proceed in order to reach equilibrium? a) Right b) Left c) It is already at equilibrium d) There is not enough information to make a determination. e) none of the above The solubility of a gas in a liquid with _____ temperature. a) increases, increasing b) decreases, decreasing c) decreases, increasing d) remains the same, increasing e) none of the above The vapor pressure of a solvent _____ with an increase in the concentration of a non-volatile solute. a) increases b) decreases c) remains the same d) none of the above Consider the phase diagram below. If the dashed line at 1 atm of pressure is followed from 100 to 500 degree C, what phase changes will occur (in order of increasing temperature)? a) condensation, followed by vaporization b) fusion, followed by vaporization c) vaporization, followed by deposition d) sublimation, followed by deposition e) No phase change will occur under the conditions specified. The solubility of solid solutes with negative heats of solution is increased with a(n) _____. a) increase in temperature b) decrease in temperature c) increase in pressure d) decrease in pressure e) none of the above The vapor pressure of benzene at 25 degree C is 96.0 mmHg and at the same temperature the vapor pressure of toluene is 30.3 mmHg Which of the following is a reasonable vapor pressure for a benzene toluene solution at 25 degree C? a) 102 mmHg b) 29.2 mmHg c) 63.2 mmHg d) not enough information e) none of the above Which of the following statements is FALSE? a) The rate of vaporization increases with increasing temperature. b) The rate of vaporization increases with decreasing strength of intermolecular forces. c) Molecules with hydrogen bonding are more volatile than compounds with dipole-dipole forces. d) The rate of vaporization increases with increasing surface area. e) None of the above are false. Place the following substances in order of increasing boiling point. a) Ne

Explanation / Answer

Ans 1. a) right

Qc(Reaction quotient) = [PCl3] [Cl2] / [PCl5]

Qc = (0.020) (0.30) / 4.00 x 10-3

Qc = 1.5

so you see Qc < kc

so the reaction must move forward that is to its right.

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