Question 2 CH13

1) For the reaction 2A(g)+2B(g)⇌C(g) Kc = 68.4 at a temperature of 311 ∘C . Calculate the value of Kp. Express your answer numerically.

2)

For the reaction

X(g)+3Y(g)⇌2Z(g)

Kp = 1.76×10⁻² at a temperature of 255 ∘C .

Calculate the value of Kc.

What kind of an effect does an enzyme have on the rate of the forward and reverse reactions, the energy of the products and reactants and the energy of the transition state?

Cryolite, Na3AlF6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. Balance the equation

Al2O3 (s) + 6NaOH (l) +12HF (g) --> 2Na3AlF6 + 9H2O (g) (I think I've already correctly done this)

A. if 10.5 kilograms of Al2O3(s), 52.4 kilograms of NaOH(l), and 52.4 kilograms of HF(g) react completely, how many kilograms of cryolite will be produced

B.What is the total mass of the excess reactants left over after the reaction is complete?

Sulfuric acid solutions containing 60 wt% H2SO4 (specific gravity =1.498) is to be diluted to a 4.00 molar solution (specific gravity=1.213) Calculate(a)the mass fraction of sulfuric acid in the product stream (b)taking 100 kg of feed solution, 60% sulfuric acid as a basis, calculate the kg of water for dilution and the kg of final acid

Which of the following mixtures will be a buffer when dissolved in a liter of water?

1. Calculate the molarity of a solution made by dissolving 0.4000 g of acetylsalicylic acid (180.15 g/mol) in 250.00 mL of water.

2. Calculate the volume of the solution prepared in (1) needed to make 100.00 mL of solution with a concentration of 4.00 x 10–4 M.

3. What are the correct units for molar absorptivity according to Beer’s Law?

4. Describe how you will determine the concentration of acetylsalicylic acid in your individual diluted aspirin-tablet solutions. (Hint: Think Beer’s Law Plot)

5. Set up the calculation for the concentration of acetylsalicylic acid in the undiluted 250-mL aspirin-tablet solution. (Assume a conc. of 3.60 x 10-4 M from the standard curve).

6. Set up the calculation for the mass percent of acetylsalicylic acid in the tablet your team tested. (Use your answer from previous question and use a total mass for the tablet of 0.4000g).

Estimate the value of the equilibrium constant at 640 K for each of the following reactions. ΔH∘f and S∘ for BrCl(g) is 14.6 kJ/mol and 240.0 Jmol⋅K, respectively. for the following

1. 2NO2(g)⇌N2O4(g)

2.Br2(g)+Cl2(g)⇌2BrCl(g)

Write balanced net ionic equations for the following reactions in acid solution.

a. Liquid hydrazine reacts with an aqueous solution of sodium bromate. Nitrogen gas and bromide ions are formed.

b. Solid phosphorus (P4) reacts with an aqueous solution of nitrate to form nitrogen oxide gas and dihydrogen phosphate (H2PO4 -) ions.

c. Aqueous solutions of potassium sulfite and potassium permanganate react. Sulfate and manganese (II) ions are formed.

Suppose that the microwave radiation has a wavelength of 10.8 cm . How many photons are required to heat 295 mL of coffee from 25.0 ∘C to 62.0 ∘C? Assume that the coffee has the same density, 0.997 g/mL , and specific heat capacity, 4.184 J/(g⋅K) , as water over this temperature range. Express the number of photons numerically.

a) Name all the epimeric pairs you can find in these diastereoisomers. At what positions are they epimeric?

Using any two of these diastereoisomers as examples, name their enantiomers and anomers.

D-allose, D-altrose. D-mannose, D-glucose, D-gulose, D-galactose, D-talose, D-idose

b) Using any two of these diastereoisomers as examples, name their enantiomers and anomers.

If the decomposition of 45.987g ammonium nitrate is carried out at 18.0 degrees C and 786.3 mmHg, what volume of dinitrogen monoxide gas will form? The other product of the reaction is gaseous water. What volume of water will form during this reaction?

Pyridine (C₅H₅N) is a particularly foul-smelling substance used in manufacturing pesticides and plastic resins. Calculate the pH of a 0.145 M solution of pyridine (K_b = .00000000140).

The Ostwald process is used commercially to produce nitric acid, which is, in turn, used in many modern chemical processes. In the first step of the Ostwald process, ammonia is reacted with oxygen gas to produce nitric oxide and water. What is the maximum mass of H2O that can be produced by combining 57.7 g of each reactant?

what is the maximum mass of H2O that can be produced by combining 57.7g of each reactant?

4NH + 5O2 --------> 4NO + 6H2O

__________ g H2O

Chapter 15 1) The name of HClO is ________. a. hydrogen chloride b. hydrochloric acid c. chloric acid d. perchloric acid e. hypochlorous acid 2) Identify the Bronsted-Lowry acid in the following reaction. H2O + CO3 2- (aq) ? HCO3 - (aq) + OH- (aq) a. H2O b. CO3 2- c. HCO3 - d. OHe. H2CO3 3) What is the [H3O+] in a solution with [OH- ] = 1.0 � 10-12 M? a. 1.0 � 10-12 M b. 1.0 � 102 M c. 1.0 � 10-7 M d. 1.0 � 10-8 M e. 1.0 � 10-2 M 4) What is the [OH- ] in a solution that has a [H3O+] = 1.0 � 10-6 M? a. 1.0 � 10-2 M b. 1.0 � 10-6 M c. 1.0 � 10-8 M d. 1.0 � 10-10 M e. 1.0 � 10-12 M 5) The [H3O+] of a solution with pH = 2.0 has a concentration of ________. a. 10 M b. 0.1 M c. 1 � 102 M d. 1 � 10-2 M e. 1 � 10-12 M 6) Which of the following is the strongest acid? a. H3PO4 b. NH4 + c. NaOH d. H2CO3 e. HCl 7) Which of the following is correctly identified? a. NH3, strong acid b. NaOH, strong base c. HCl, weak acid d. H2CO3, strong acid e. Ca(OH)2, weak base 8) Ammonia is a weak base because a. it is a dilute solution. b. it is only slightly soluble in water. c. it cannot hold on to its hydroxide ions. d. it produces few hydroxide ions in water. e. it is completely ionized in aqueous solution. 9) Which of the following is a neutralization reaction? a. KCl + NaNO3 ? KNO3 + NaCl b. HNO3 + KOH ? H2O + KNO3 c. H2O + SO3 ? H2SO4 d. 4Na + O2 ? 2 Na2O e. 2 NO2 ? 2NO + O2 10) Which of the following is a buffer system? a. NaCl and NaNO3 b. HCl and NaOH c. H2CO3 and KHCO3 d. NaCl and NaOH e. H2O and HCl