Determine the heats of formation or the steric energies of the exo- and endo-anhydride adducts using a molecular mechanics program. What do these energies tell you about the mechanism of the reaction?
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The rate constant for the reaction:
2A -> 2B + C
is 0.881M-1*s-1 at 333 degrees Celcius.
(a) Starting with a concentration of 0.0955 M, calculate the concentration of A after 12.5 seconds.
(b) Calculate the half-live when [A] = 0.0444 M.
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Problem 8.71 Using bond enthalpies (Table 8.4 in the textbook), estimate ΔH for each of the following reactions. |
Part A 2CH4(g)+O2(g)→2CH3OH(g)
SubmitMy AnswersGive Up Correct Part B H2(g)+Br2(g)→2HBr(g)
SubmitMy AnswersGive Up Correct Part C 2H2O2(g)→2H2O(g)+O2(g)
SubmitMy AnswersGive Up Incorrect; Try Again |
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Calculate the amount of solution (g or mL) that contains each of the following amounts of solute.
5.2 g of LiNO3 from a 35 %(m/m) LiNO3 solution.
31.6 g of KOH from a 20.0 %(m/m) KOH solution.
3.1 mL of formic acid from a 18 %(v/v) formic acid solution.
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Thermodynamics of potassium nitrate dissolving in water experiment post-lab questions: What does the sign of the delta G tell you about the dissolution process for this experiment? Is the dissolution process spontaneous at all temperature? If not at what temperature does this spontaneity change?
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Why does the Doppler effect lead to a shift in the atomic emission frequencies of hydrogen atoms in a star but a broadening of the atomic emission frequencies of hydrogen atoms in a gas?
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When the following equation is balanced properly under acidic conditions, what are the coefficients of the species shown? 2 Fe + MnO4- 2 Fe2+ + Mn2+ Water appears in the balanced equation as a product (reactant, product, neither) with a coefficient of 2 . (Enter 0 for neither.) How many electrons are transferred in this reaction?
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Describe briefly (4-6 sentences) what factors are responsible for influencing what face of a π-system in a chiral environment a reagent will attack from.
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If the hydrolysis to the diacid is not complete, how could you separate the desired diacid from the unhydrolyzed anhydride by extraction?
You carry out a reaction starting with 200 mg of cyclopentadiene and 300 mg of maleic anhydride and 375 mg of the cycloadduct anhydride is obtained. Calculate the % yield for the anhydride. Show your calculation.
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Calculate the freezing point of two aqueous solutions, one containing 15% magnesium chloride by weight, the other 15% ethyl alcohol (CH3CH2OH) by weight. show all calculations
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The Ka of benzoic acid is 6.5 x 10 ^(-5)
a) Calculate the pH of a 40.00 mL, 0.1 M benzoic acid buffer solution after the addition of 20.00 mL of a 0.1M NaOH
b) Calculate the pH of a 40.00 mL, 0.1 M benzoic acid buffer solution after the addition of 50.00 mL of a 0.1M NaOH
REDOX TITRATION
2) Express the reactions for potassium permanganate titration with sodium oxalate: Hint: include the 2 half-reactions.
3) What is the percent oxalate in a 1.723 g sample if 31.10 mL of 0.019M permanganate solution is required for titration?
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: carbonyl(CO) is strong field ligand so [Ni(CO)4] should have square planar shape but by the experiment [Ni(CO)4] is tetrahedral.Explain this statement.
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How may grams of solute are needed to prepare the following solutions?
1.000L of 240.0M NaCl
250.0 mL of 0.135 M CuSO4
500.0 mL of 0.370 M CH3OH
Also, please tell how you got answers so I can know how to get calculations myself. THANK YOU :-)
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In: Chemistry
A conductivity cell when standardized with 0.01 M KCl was found to have a resistance of 189 Ω. With 0.01 M ammonia solution the resistance was 2460 Ω. Calculate the bas dissociation constant of ammonia, given the following molar cconductivities at these concentrations: λ(K+) = 7305 Ω-1cm2mol-1; λ(Cl-) = 76.4 Ω-1cm2mol-1; λ(NH4+) = 73.4 Ω-1cm2mol-1; λ(OH-) = 198.6 Ω-1cm2mol-1.
In: Chemistry