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Once the chromatographic column has been prepared , why is it important to allow the level of the liquid in the column to drop to the level of the alumina before applying the solution of the compoun
At 298K, S2F4(g) partially decomposes to SF2 (g). at equilibirum the partial pressure of SF2(g) is 8.4x10-2torr and the partial pressure of S2F4(g) is 36.8 torr.
Combustion of 3.50g of ethanol, C2H5OH (l) ina calorimeter with a heat capacity of 15.2kJ/°C causes a temperature increase from 19.88°C to 26.18°C. Find the molar enthalpy of combustion
Chloromethane, CH3Cl, arises from the oceans and from microbial fermentation and is found throughout the environment. Itis used in the manufacture of various chemicals and has been usedas a topical
(a) What is the impedance of the circuit? (b) What is the phase angle for this circuit? (c) What is the average power supplied to the circuit?
Benzoic acid is a white, crystalline powder used as a food preservative. It consists of carbon, hydrogen, and oxygen. If 0.0500 grams of the compound are burned in excess O2 ,0.126 grams CO2&nb
A 24 hour urine specimen was diluted to 2L \after the solution was buffered to pH10 a 10 ml aliquot was titrated with 27.32 ml of0.003969M EDTA The Calcium in the second aliquot was isolated asCaC2O
A saturated solution of potassium chlorate is dissolved in 100 gof water. If the saturated solution is cooled from90°C to 60°C, how many grams of precipitate will be formed?explain.
A 1.4 wood block is pulled along a wood floor at a steady speed. A second wood block, with mass 2.9 , is attached to the first by a horizontal string. What is the magnitude of the force pulling on t
A solution containing Pt4+ is electrolyzed with acurrent of 3.60 A. How many minutes will it take to plate out 89.0 percent of the platinum in 0.550 L of a 0.0150 M solution of Pt4+?
A spherical balloon has a diameter of 50.0 cm, absolute pressure inside is 1.25atm and the temperature is 22 degree Celsius. Assume that all the gas in N2 is of molar mass 28.0 g/mol. (a) find the
An unknown concentration of a solution gave a Percent Transmittance of 68% under Spectronic 20 passing through 8mm path length. Calculate its concentration given that the molar absorbtivity of the s
What speed would an astronaut need to give a lunar golfball in order to put the ball in orbit aound the Moon?
Four +7 µC point charges are at the corners of a square of side 1 m. Find the potential at the center of the square (relative to zero potential at infinity) for each of the following condition
A 15.0 kg turntable with a radius of 25 cm is covered with a uniform layer of dry ice that has a mass of 9.0 kg. The angular speed of the turntable and dry ice is initially .75 rad/s, but it increas
A buffer system, that is important for humans, is formed between carbonic acid and the bicarbonate ion. Calculate the molar ratio of bicarbonate ion to carbonic acid present at pH 7.56. (Ka = 4
A series RC circuit has a time constant of 0.930 s. The battery has an emf of 48.0 V, and the maximum current in the circuit is 490 mA. (a) What is the value of the capacitance?
When determining pH of atitration (weak acid strong base) using equilibrium constants, what purpose does hydrolysis serve and how is the pH determined usingit?
Suppose that you wish to fabricate a uniform wire out of 0.800 g of copper. If the wire is to have a resistance R = 0.300 , and if all of the copper is to be used. (a) What will be the length of the
A series RC circuit has a time constant of 0.880 s. The battery has an emf of 51.0 V, and the maximum current in the circuit is 500 mA. (a) What is the value of the capacitance?
Determine the average mass of an ice cube produced by an ordinary refrigerator standard ice cube maker.Statethe type and model of refrigerator.Provide any necessary detailed about the ice cube maker
If the loop of wire carries a current of 10 amperes, what is the magnitude and direction of the net magnetic force on the loop? (Ignore the forces on the straight connecting wires, and the fact that
A 1.6-m-tall woman stands 2.0 m in front of a convex funhouse mirror with a focal length of 2/3 m . Use ray tracing to determine the location of her image. Use ray tracing to determine height of her
A solution is prepared by dissolving 0.17mol of acetic acid and 0.17 mol of ammonium chloride in enoughwater to make a 1.0 L of solution. Find the concentration of ammonia in the solution
Two very small spheres are initially neutral and separated by a distance of 0.56 m. Suppose that 6.9 x 1013 electrons are removed from one sphere and placed on the other. What is the magnitude of th