Given the following organic equation and data, calculate the experimental percent yield of benzoic acid in grams:
11.29 mL of ethyl benzoate was reacted with 6.3 grams of sodium hydroxide under reflux conditions using ethylene glycol and water as the solvents. After workup, 6.67 grams of benzoic acid was recovered.
you will have to determine limiting reagent, calculate theoretical yield and finally, calculate the percent yield.
Give answer in this format: XX.X %
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A process stream flowing at 35 kmol/h contains 15 mole% H2 and the remainder 1-butene. The stream pressure is 10.0 atm absolute, the temperature is 50 oC and the velocity is 150 m/min. Determine the diameter (cm) of the pipe transporting this stream, using Kay’s rule in your calculations.
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Derive a general expression for the spacing between adjacent energy levels in the 2D Rigid Rotor.
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Part A:
How many coulombs are required to plate a layer of chromium metal 0.24 mm thick on an auto bumper with a total area of 0.29 m2 from a solution containing CrO2−4? The density of chromium metal is 7.20 g/cm3. Express your answer using two significant figures. Q = ______ C
Part B:
What current flow is required for this electroplating if the bumper is to be plated in 16.8 s ? Express your answer using two significant figures.
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Please explain each of the questions, thanks.
1. Describle the correlation between bond energy and bond length for a series of single bonds.
2. Describle, with appropriate explanantions, the key factors which affect the magnitude of the lattice energy of an ionic substance.
3. Explain why hydrogen is placed in Group IA even though it really belongs in a group by itself.
4. Explain when and why chemists make use of the concept of hybridization.
5. Explain why the first member of each period (row) in the periodic table differs so greatly from the rest of the elements in the same period.
6. Explain how the elements in Group IVA differ.
7. Explain why the trend in electron affinity increases in general as you move from left to right across a period (row) of the periodic table.
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A biochemist has 100 mL of a buffered solution at pH 7.3. The concentration of the buffer is 0.1 M, and the pKa of the buffer is 7.8. If the biochemist adds 80 mL of a 0.1 N KOH solution to the above buffered solution, what will be the final pH to the nearest tenth of a unit?
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We’re going to titrate formic acid with the strong base, NaOH. There is initially 100. mL of 0.50 M formic acid and the concentration of NaOH is 1.0 M. All work MUST be shown to receive credit. See announcement for due date.
a) What is the initial pH of the formic acid solution?___________
b) What is the percent ionization under initial conditions? __________%
c) After the addition of 10 mL of NaOH, what is the pH? ___________
d) After the addition of 25 mL of NaOH, what is the pH? Think ___________
about where in the titration this brings you.
e) What volume of NaOH is required to reach the equivalence point? ___________
f) What is the pOH at the equivalence point? ___________
g) What is the pH at the equivalence point? ___________
h) If, instead of NaOH being added, 0.05 moles of HCl is added by __________%
bubbling the gas through the solution. Assume that the volume has not changed. What is the percent dissociation of formic acid?
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Elements Beryllium,Magnesium,Calcium, and Strontium are elements in group 2. These elements are relatively reactive-they will react with oxygen,acid and bases. Consequently they are found as minerals and are combined with other elements. What is mineral? These minerals have monetary value to a variety of global industries. Where in the world would you mostly likely find minerals (or pure forms)of each of these elements in groud 2,periods 2-5?
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A metal, M, forms a nitride compound with the formula M3N2. This compound is 84.78 % M by mass and 15.22 % N by mass. Calculate the molar mass of the metal, M.
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Rank the following elements by electron affinity, from most positive to most negative EA value.
cesium, argon, iodine, selenium, arsenic
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Solubility of Gases
8. What is the
saturation concentration of DO
at 10°C in mg/L?
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Write a balanced equation from each line notation:
a) Ag(s)|Ag¹ᐩ(aq)||Cr³ᐩ(aq)|Cr(s)
b)Pb(s)|Pb²(aq)||MnO₂(aq)|Mn²ᐩ(aq)|Pts)
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A 2.2222 gram sample containing soda ash is dissolved in a 100 mL volumetric flask. A 24.98 mL aliquot is analyzed and required 45.67 mL of 0.1234 M HCl, before it was boiled, cooled, and back-titrated with 8.88 mL of 0.0987 M NaOH. What is the percent Na2CO3?
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A 250mL buffer solution is 0.250M in acetic acid and 0.250M in sodium acetate.
A) What is the pH after the addition of 0.005 mol of HCl?
B) What is the pH after the addition of 0.005 mol of NaOH?
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1)Consider the titration of 50.0 mL of 0.20 M NH3 (Kb=1.8
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