(HW5-27)
The amount of energy released by burning a fuel source, measured in energy per mass, is called the fuel value. If all the energy obtained from burning 1.27 pounds of butane (fuel value is 10.85 kcal/g) is used to heat 127.5 kg of water at an initial temperature of 18.7 °C, what is the final temperature?
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Which neutral atom is isoelectronic with each of the following ions: Ga3+, Ca2+, Mn7+, K+, Pb2+?
Express your answers as chemical symbols separated by commas.
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Henderson-Hasselback ( please solve using this equation!)
You need to make a 0.1M solution of Glycine (9.4), however your lab is completely out of glycine powder. you do however have 1 liter of 0.1M glycine pH 9 and 1 liter of 0.1M Glcine pH 10. How could you mix these two solutions togther to generate 200ml of your desired solution. pKA of glucine 9.25.
please outline all the steps as clearly as you can.
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1. On an index card or piece of notebook paper, draw a structure (see #3 below)
2. For the structure you draw, indicate how many total peaks it would have in its regular 13C NMR spectrum, how many DEPT 90 peaks, how many negative peaks in the DEPT 135, and finally how many positive peaks in DEPT 135.
3. Please use the following parameters for your structure:
LAST NAME A-C: a compound with 8 carbons or less that does NOT include a ring
LAST NAME D-H: a compound with between 9 and 12 carbons that includes a ring
LAST NAME L-Sal: a compound with 8 carbons or less that includes a ring
LAST NAME Set-W: a compound with between 9 and 12 carbons that does NOT include a ring
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Problem 10.33
Complete the following table for an ideal gas:
| P | V | n | T |
| 2.10 atm | 1.40 L | 0.480 mol | ? K |
| 0.320 atm | 0.250 L | ? mol | 22 ∘C |
| 670 torr | ? L | 0.333 mol | 360 K |
| ? atm | 595 mL | 0.260 mol | 295 K |
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Rank the following elements by electron affinity, from most positive to most negative EA value
Bi, Cl,Te,He,Na
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Predict whether or not a precipitate will form upon mixing 175.0 mL of a 0.0055 MKCl solution with 145.0 mL of a 0.0015 M AgNO3 solution. Identify the precipitate, if any. Express your answer as a chemical formula.
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Consider the reaction occurring at 25∘C.
A(s)+ B2+(aq)→ A
2+(aq)+ B(s) ΔGorxn=−11.0
kJ
Determine the value of E∘cell and K for the reaction and complete the table.
| [B2+] (M) | [A2+] (M) | Q | Ecell | ΔGrxn |
| 1.00 | 1.00 | |||
| 1.00 | 1.00×10−4 | |||
| 1.00×10−4 | 1.00 | |||
| 1.18×10−2 | 1.00 |
What is the value Ecell and K
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Sodium trioxalatocobaltate (III) trihydrate is
prepared by the following reactions:
[Co(H2O)6Cl2] + K2C2O4 *H2O >>> Co2O4 + 7 H2O
2CoC2O4 + H2O2 + 4 Na2C2O4 >>> 2 Na3[Co (C2O4)3*H2O + 2NaOH
what is the percent yield of Na3[Co (C2O4)3*H2O if 7.6 grams are obtained from 12.5 grams of [Co(H2O)6]Cl2 ? ( assume excess amount of the other reagents.)
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calculate E cell at 298 K (25 c) for Zn (s) + Cu 2+ (aq) --> Zn 2+ (aq) + Cu (s) when [Zn 2+]=.0010 M and [Cu 2+]=.10 M
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Determine the mg of aspirin in a commercial aspirin tablet labeled to contain 5 grains using the following data: 800.0 mg of pure aspirin was treated as the experiment called for and diluted to exactly 1000.0 mL. A reagent blank was prepared and set to read 0.00 absorbance. Exactly 10.00 and 5.00 mL of the standard aspirin solution were each treated with 10 mL of Fe 3+ solution, diluted to exactly 100.0 mL and found to have absorbances of 0.837 and 0.410 respectively. A 374.5 mg commercial aspirin tablet was treated as the experiment called for and diluted to exactly 500.0 mL. Exactly 10.00 and 5.00 mL of the sample solution were each treated with 10 mL of Fe 3+ solution, diluted to exactly 100.0 mL and found to have absorbances of 0.694 and 0.336 respectively. Comment
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Terephthalic acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only C, H, and O. Combustion of 20.40 mg terephthalic acid produces 43.23 mg CO2 and 6.64 mg H2O. If 0.271 mole of terephthalic acid has a mass of 45.0 g, determine the molecular formula for terephthalic acid
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what preliminary test results are you looking for to identify conclusively your unknown solutions as this set : AgNO3(aq), Ba(NO)3(aq), HCl(aq), H2SO4(aq), NaOH(aq) ?
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The compound K2SO4 has solubility of 15 grams in 100mL of water. How many milliliters of water are required to dissolve 53 grams of K2SO4?
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