Starting with 6.9 mL of acetic anhydride with a density of 1.082, how many grams of acetylsalicylic acid (theoretical yield) can be made? Assume acetic anhydride is the limiting reagent and a one to one stoichiometry. Give two significant digits.
In: Chemistry
Calculate the Molar solubility at 25 degrees clelcius of Cr(OH)3 In:
Water:
1.50 M Cr(NO3)3:
A solution buffered to 10.50:
(please include all of the steps)
In: Chemistry
HEPES, 2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonic acid, is a diprotic acid often used to
create buffers compatible with biological samples. A 10.0 mL sample of HEPES was titrated with
0.100 M NaOH.
a. To 2 places past the decimal point, determine the values of pKa1 and pKa2 for HEPES
b. Calculate the initial molarity of the HEPES solution to 4 sig figs.
c. A 20.0 mL portion of 0.20 M HEPES is titrated with 0.100 M NaOH. Calculate the pH at the first
and second equivalence points of the titration.
In: Chemistry
Correct calculation
A) How many moles of silver are in a 100. G sample?
B) Isoquinoline has the molecular formula C9H7N. Its molar mass in g/mol is:
c) Given the combustion of propane
C3H8 + 5O2 => 3CO2 + 4H2O
How many grams of oxygen are required to burn 8.8 grams of C3H8? (Molar masses in grams per mole- propane: 44.2; oxygen: 31.99; carbon dioxide: 44.01; water: 18.02)
In: Chemistry
In: Chemistry
A voltaic cell employs the following redox reaction: 2Fe3+(aq)+3Mg(s)→2Fe(s)+3Mg2+(aq) Calculate the cell potential at 25 ∘C under each of the following conditions.
A) [Fe3+]= 1.9×10−3 M ; [Mg2+]= 2.80 M
B) [Fe3+]= 2.80 M ; [Mg2+]= 1.9×10−3 M
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What is the expected aromatic hydrocarbon reactivity of these compounds and why ? (which is the fastest and which is the slowest and why?) a bromine solution in acetic acid was added to these compound.
Toluene , Acetanilide , Benzhydrol, Anisole, Diphenyl ether
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What is the basic structure of lecithins, and how do they work as emulsifiers, and in membranes?
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Calculate the solubility of Mn(OH)2 in grams per liter when buffered at pH=7.0, 9.8, 11.8. Assume that buffer capacity is not exhausted.
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In the second row of the transition metals there are five elements that do not follow the normal orbital filling. Five - Nb, Mo, Ru, Rh, and Ag-result in a[Kr] 5s14dx configuration and Pd results in a [Kr] 4d10 configuration. Write the ground state electron configuration for the following species. |
Part A Mo Use the buttons at the top of the tool to add orbitals. Click within the orbital to add electrons. SubmitMy AnswersGive Up Part B Mo+ Use the buttons at the top of the tool to add orbitals. Click within the orbital to add electrons. SubmitMy AnswersGive Up Answer Requested Part C Ag Use the buttons at the top of the tool to add orbitals. Click within the orbital to add electrons. SubmitMy AnswersGive Up Correct Part D Ag+ Use the buttons at the top of the tool to add orbitals. Click within the orbital to add electrons. SubmitMy AnswersGive Up Incorrect; Try Again; 5 attempts remaining Part E Ru Use the buttons at the top of the tool to add orbitals. Click within the orbital to add electrons. SubmitMy AnswersGive Up Incorrect; Try Again; 5 attempts remaining Part F Ru3+ Use the buttons at the top of the tool to add orbitals. Click within the orbital to add electrons. SubmitMy AnswersGive Up Incorrect; Try Again; 5 attempts remaining Part G Rh Use the buttons at the top of the tool to add orbitals. Click within the orbital to add electrons. SubmitMy AnswersGive Up Part H Rh2+ Use the buttons at the top of the tool to add orbitals. Click within the orbital to add electrons. SubmitMy AnswersGive Up Part I Pd Use the buttons at the top of the tool to add orbitals. Click within the orbital to add electrons. SubmitMy AnswersGive Up Part J Pd+ Use the buttons at the top of the tool to add orbitals. Click within the orbital to add electrons. SubmitMy AnswersGive Up Part K Pd2+ Use the buttons at the top of the tool to add orbitals. Click within the orbital to add electrons. SubmitMy AnswersGive Up |
In: Chemistry
hemistry 1215, Experiment #12; Determination of the Atomic Weight of an Unknown Metal, Post-lab Name ____________________________________ 1. A student who was measuring the atomic weight of a metal failed to thoroughly clean her metal ribbon leaving an oxide coat on the metal. Will the volume of hydrogen gas generated be lower or higher than the true value? 2. What volume will 5.00 g of helium gas occupy at 0.800 atmospheres and 25 o C? 3. Use Dalton’s law of partial pressures to calculate the pressure of hydrogen gas collected over water if the ambient pressure is 710 mm Hg and the temperature is 25o C. 4. A student didn’t equalize the water levels inside the eudiometer tube with that of his water bath. The water level inside the tube was 10 cm higher than the water level outside the tube. He ignored the difference and proceeded with his calculations. What effect will this error have on his calculated atomic mass? Explain your rationale.
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Determine the mass (in g) of sodium hydrogen phosphate
(Na2HPO4) that must be added to 87.8 mL of
0.0264 M sodium dihydrogen phosphate to yield a pH of 7.78. Report
your answer to 3 significant figures.
Assume the volume of the solution does not change and that the 5%
approximation is valid.
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How much heat (in kJ) is required to warm 13.0 g of ice, initially at -13.0 ∘C, to steam at 113.0 ∘C? The heat capacity of ice is 2.09 J/g⋅∘C and that of steam is 2.01 J/g⋅∘C.
In: Chemistry
TRUE or FALSE? Please explain each answer!
a) The more negative the ∆H value of a reaction the faster it is.
b) The more negative the ∆G value of a reaction the faster it is.
c) If you compare two reactions, the one with the lowest activation energy is faster (tricky!)
d) A catalyst is a substance that lowers the ∆G value of a reaction so it becomes more spontaneous.
e)Enzymes are proteins that lower the activation energies of reactions in the cell.
f) ATP hydrolysis is thermodynamically favorable but the reaction is slow in the absence of the enzyme specialized in catalyzing this reaction.
In: Chemistry
In: Chemistry