Question

7) The reaction below is exothermic 2502 (8) + 02 (8) 2503 (8) will result in an increase in the number of moles of SO3 (8) in Le Chatelier's Principle predicts that the reaction container. A) increasing the volume of the container B) increasing the pressure C) increasing the temperature D) decreasing the pressure E) removing some oxygen 2B. For this reaction the value of the equilibriur 8) Shown below is a concentration vs. time plot for the reaction A constant is 0.100 Concentration (M)- & 1.00 4.00 2.00 Time (min) 3.00 - A) Ke<1. B) Ke=0. C) Ke=1. D) Kc>1. 9) What is the conjugate acid of NH3? A) NH3 B) NH OH NH2 D) NH* E) NH3* 10) What is the pH of an aqueous solution at 25.0 °C in which [OH-] is 0.00250 M? A) +2.60 B) -2.60 C) +11.4 D) -11.4 11) What is the pH of a 0.0025 M aqueous solution of HCl at 25.0°C ? A) -2.60 B) -3.40 C) 2.25 D) 3.40 E) -2.25 E) 2.60 12) The Ka of hypochlorous acid (HCIO) is 3.00 10-8. What is the pH at 25.0 °C of an aqueous solution that is 0.0200 M in HCIO? A) +2.45 B) -2.45 C) -9.22 D) +9.22 E) +4.61 13) The acid-dissociation constants of phosphoric acid (H3PO4) are Kai -75 x 10-3, K2 = 6.2 10-8, and Kaz - 4210-13 at 25.0°C. What is the pH of a 25 M aqueous solution of phosphoric acid? A) 0.40 B) 0.13 C) 0.87 D) 1.8 E) 2.5 A-2
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Answer 1

-7) 25029) + O2(g) = 2509 (g) + xuj exothermic heat content A increasing the volume of container means reducing pressure of system. This to A pressure decrease shifts equillibrium towards the side of more moes of gasi; in this case reactando sides ..so, decrease B) Inceasing pressure shifts equillibrium towards less -mole side product side here. so increases e) Increase in temperature means adding heat content je populating product side with heat in an exothermic reaction ... more product shifts eam towards reactant .. Son decrease d) decreasing pressure will reduce są .. Explanation (A) * ex removing oxygen, mens removing reactant, To balance 1. product reactant eam shift occurs. so decreases is B is the right answers.... . 8) Equilibrium const is obtained from the plot, where the constants are concentrations become constant of time for reactant concentration is dos e to [2] = 0.1 for pott nu to [BJ = 0.5 a ke 2 TAB 20:35 .. ke si PBT

- a > Profonation af NH3 giver what .. conseok odd 4 NH, is NHÀ 10> [ok] = 0.0025Mo s issa: POH = -log Cow] lik? = -log (0.0025) a indring portats a l care = 2:6 more wis Now PH + POH = 14 in Standard pH scale pH= 14-POH = 11:4 obtura !A-192 IX HCl is a strong acid and is 100% inized in paper !!!1 [HJ 16. 0.0025 M PP - lea : 2 5. zubileen abis series in the winį about