CHE 1302 Lecture 7: ch 14 PCl5 examples - Kc and Kp

What is the mass of 0.71 mol Na? 1.2 times 10^-24 g 0.031 g 32 g 12 g 16 g What is the mass percent of chlorine in magnesium chloride? 74.47% 37.24% 59.33% 40.67% 25.53% You have 2.50 g of each of the following elements: Ca, Cu, Cs, C, and Cr. Which sample contains the largest number of atoms? Cr Cs Cu Ca C The speed of sound at one atmosphere of pressure is 0.214 miles per second. What is the speed of sound in units of meters per second? (1 km = 0.621 mile) 345 m/s 4.78 times 1 0^5 m/s 133 m/s 478 m/s 4.46 times 10^4 m/s Calculate the number of moles in 0.48 g Cu. 0.48 mol 7.6 times 10^-3 mol 0.033 mol 31 mol 1.3 times 10^2 mol If the fuel efficiency of an automobile is 32 miles per gallon, what is its fuel efficiency in kilometers per liter? (1 km = 0.621 mile, 1.000 L = 1.057 quarts, 4 quarts = 1 gallon) 5.3 km/L 2.0 times 10^2 km/L 75 km/L 20 km/L 14 km/L What is the net ionic equation for the reaction of aqueous hydrochloric acid and aqueous potassium hydroxide? HCl(aq) + KOH(aq) rightarrow KCl(aq) + H_2 O(l) Cl^-(aq) + K^+ (aq) rightarrow KCl(s) Cl^- (aq) + K^+ (aq) rightarrow KCl(aq) H^+ (aq) + OH^- (aq) rightarrow H_2 O (l) HCl(aq) + OH^-(aq) rightarrow H_2 O (l) + Cl^- (aq) What are the spectator ions in the reaction between aqueous hydrobromic acid and aqueous sodium hydroxide? H^+ and OH^- Na^+ only Na^+ and Br H^+, Br, Na^+, and OH Br only

In an experiment, 0.34 mol H_2 and 0.34 mol I_2 are mixed in a 1.00-L container, and the reaction forms HI. If K_c = 49, for this reaction, what is the equilibrium concentration of HI? I_2(g) + H_2(g) 2HI(g) A) 0.85 M B) 0.60 M C) 0.53 M D) 0.65 M E) 0.045 M A first-order chemical reaction is observed to have a rate constant of 32 min^-1. What is the corresponding half-life for the reaction? A) 46 min B) 1.3 min C) 45.8 s D) 1.3 s E) 1.9 s The rate law for the chemical reaction 5Br^-(aq) + BrO_3^-(aq) + 6H^+(aq) rightarrow 3Br^2(aq) + 3H_2O(l) has been determined experimentally to be Rate = k[Br^-][BrO_3^-][H^+]^2. What is the overall order of the reaction? A) 3 B) 5 C) 1 D) 4 E) 2 Consider the following equilibrium; PCI_3(g) + Cl-2(g) PCl_5(g); Delta H = -92 kJ The concentration of PCI_3 at equilibrium may be increased by A) increasing the pressure. B) adding Cl_2 to the system. C) the addition of neon. D) the addition of PCl_5. E) decreasing the temperature.

For the reaction given below, 2.00 mol of A and 3.00 mol of B are placed in a 6.00-L container. A(g) + 2B(g) C(g) At equilibrium, the concentration of A is 0.255 mol/L. What is the concentration of B at equilibrium? A) 0.255 mol/L B) 0.343 mol/L C) 0.500 mol?l D) 0.510 mol/L E) none of these A sample of ammonia gas was allowed to come to equilibrium at 400 K. 2NH_3(g) N_2(g0 + 3H_2(g) At equilibrium, it was found that the concentration of H_2 was 0.0420 M, the concentration of N_2 was 0.0140 M, and the concentration of NH_3 was 0.222 M. What is K_q for this equilibrium? (R = 0.0821 L - atm(K - mol)) A) 1.70 times 10^-3 B) 4.28 C) 1.95 times 10^-4 D) 2.85 E) 2.26 times 10^-2 In a first- order reaction, the half-life is 138 minutes. What is the rate constant? A) 0.301 s^-1 B) 8.37 times 10^-5 s^-4 C) 1.21 times 10^-4 s^-1 D) 5.02 times 10^-3 s^-1 E) 5740 s^-1 At 400 K, an equilibrium mixture of H_2, I_2, and HI consists of 0.069 mol H-2, 0,068 mol I_2, and 0.13 mol HI in a 4.5-l flask. What is the value of K_p for the following equilibrium? (R = 0.0821 L middot atem (k middot mol)) 2HI(g) H_2(g) + I_2(g) A) 0.29 B) 8.5 C) 0.037 D) 3.4 E) 27 For the reaction IO_3^-(aq) + 51(aq) + 6H'(aq) rightarrow 3I_2(aq) + 3H_2O(I) the rate of disappearance of I^-(aq) at a particular time and concentration is 2.8 times 10^-3 mol/(L middot s). What is the rate of appearance of I_2(aq)? A) 4.7 times 10^-3 mol (L middot s) B) 1.7 times 10^-3 mol/(L middot) C) 8.4 times 10^-3 mol/(L middot) D) -1.7 times 10^-3 mol/(L middot s) E) 6.0 times 10^-3 mol/(L middot s) Consider the following equilibrium: CO_2(g) + H_2(g) CO(g) + H_2O(g); K_e = 1.6 at 1260 K Suppose 0.029 mol CO_2 and 0.022 mol H_2 are placed in a 3.50-L vessel at 1260 K. What is the equilibrium partial pressure of CO(g)? (R = 0.0821 L middot atm/(K middot)) A) 0.65 atm B) 0.21 atm C) 3.6 atm D) 0.86 atm E) 1.5 atm