500 lbm/min hydrocarbon feed is pumped into the feed point halfway to the top of a distillation tower. The tower feed point is 40.0 feet above holding tank for the hydrocarbon. The pressure in the holding tank is 25.0 psia. The pressure in the tower at the feed point is 85.0 psia. Assume the energy lost due to friction is negligible. There is no significant change in velocity. The hydrocarbon density is 55.0 lbm/ft 3 . Calculate the pump power required in hp and watts.
In: Chemistry
A mixture of gases is at equilibrium:
4 NO (g) → 2 N2O (g) + O2 (g) ∆H = -199.5 kJ
(a) Does the equilibrium shift to the left or to the right when some O2 (g) is removed from the reaction mixture?
(b) Does the equilibrium shift to the left or to the right when some NO (g) is added to the reaction mixture?
c) In which direction does the equilibrium shift as the temperature is lowered?
(d) In which direction does the equilibrium shift as pressure is applied to the system?
In: Chemistry
A volume of 13.96 mL of 0.1060 M NaOH solution was used to
titrate a 0.618 g sample of unknown containing
HC7H5O3.
What is the molecular mass of
HC7H5O3? (report answers to 4 or 5
significant figures) 1.3812×102
g/mol
What is the percent by mass of
HC7H5O3 in the unknown?
In this problem what mass of sample in grams would be needed to
deliver about 23.40 mL in the next trial?
In the second trial above, exactly 1.032 g was transferred into a
flask to be titrated. If the initial buret reading is 0.10 mL,
predict what the final buret reading be. ?
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In Southern Ontario, during freezing weather CaCl2 is spread on icy highways to melt the ice. Calculate the freezing point lowering and freezing point of a solution containing 250 g of CaCl2 in 500.0 g of water.
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Fe(II) can be precipitated from a slightly basic aqueous solution by bubbling oxygen through the solution, wheich converts Fe(II) to insoluble Fe(III):
4Fe(OH)+(aq)+4OH-(aq)+O2(g)+2H2O(l) arrow 4Fe(OH)3(s)
How many grams of O2 are consumed to precipitate all of the iron in 5.0 x 101 mL of 0.065 M Fe(II)?
Please explain!
In: Chemistry
1.a.) The heat of hydrogenation of cyclohexane is -120kJ/mol. The heat of hydrogenation benzene is -208kJ/mol. Is the heat of hydrogenation of benzene more or less than you would expect
1.b.) This is the value different from the expected?
In: Chemistry
How much energy per mole is required to transfer acetic acid, a byproduct of ethanol metabolism from blood to urine. The relevant concentrations are 39.00 and 742.00 ppm respectively and you are running a fever at 39oC. State your answer in kJ/mol. (Donnan Potential Question)
EDIT: ITS ASKING FOR HOW MUCH ENERGY IN KJ/MOL IS NEEDED TO TRANSPORT ACETIC ACID FROM BLOOD TO URINE.
In: Chemistry
How might you use 2,4-dinitrophenylhydrazine to determine if the crude product obtained from the Grignard reaction between phenyl magnesium bromide and benzaldehyde contains unreacted benzaldehyde as an impurity? Use an equation to illustrate your explanation and describe what you would expect to observe.
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How and where does lactose undergo digestion in the body. Name the products.
In: Chemistry
A gas cylinder is filled with 211 torr of N2 and 615 torr of F2 and the resulting reaction forms NF3 at constant temperature and volume. N2(g) + 3 F2(g) ⎯→ 2 NF3 (g). What is the total pressure, and what are the Mole Fractions of each gas, after the reaction? (Hint: think ICE) Total Pressure at the end of Rxn: _______________ Mole Fraction of N2 = ___________ F2 = __________ NF3 = ____________
In: Chemistry
In: Chemistry
If 0.30 M HCOOH (weak acid) is prepared, what will be the hydronium ion concentration at equilibrium at 25
In: Chemistry
1. Z-2-chlorocyclopentanol and E-2-chlorocyclopentanol each react with NaOH to eliminate HCl but they give different final products C5H8O. Show how each forms
2. The reactions of bromotrichloromethane with toluene in the presence of a peroxide affords trichloromethane and benzyl bromide. Show the mechanism, indicating the chain carrying and initiating steps
3.
Show how to convert 2-hydroxypropane to 1-hydroxypropane:
(a) Using BH3 at some point
(b) Not using BH3
4.
Show the products of the reaction of Br2 with cis-2-butnene (Z) and with trans-2-butene (E). Show and them any enantiomers formed.
(a) in pentane (b) in water, forming bromoalcohols
In: Chemistry
The three-dimensional structure of the potassium channel provided a rationale for the selectivity of potassium ions and the rejection of sodium ions. Which of the following is the basis for the ability of the potassium channel to discriminate between these two ions?
The sodium ion is too small to pass through the channel.
The opening of the channel is structurally arranged such that potassium ions can bind, but is too small for sodium ions.
A restriction in the channel allows for potassium ions to be resolvated by protein ligands but is too large to effectively resolvate sodium ions.
The restriction of the channel desolvates sodium ions but not potassium ions.
In: Chemistry