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In an experiment a piece of magnesium ribbon is burned in air in a crucible. the mass of the mixture of MgO and magnesium nitride after burning is 0.470g.
The concentration of nitrogen in water at 25°C was determined to be 7.2 × 10-6 M. Calculate the partial pressure of nitrogen at the surface of the water in mmHg. The Henry's law constant
Baking powder consists of a mixture of baking soda and a substance such as cream of tartar. Baking soda is sodium hydrogen carbonate, NaHCO3. In the production of carbon dioxide gas, baking powder a
What is the minimum mass of Ammonium hydrogen sulfide that must be present in the flask initially if equilibrium is to be established at 25 oC?
Household bleach is a 5 mass % aqueous soln. of sodium hypochlorite(NaOCl). What is the molality of the bleach. What is the mole fraction of NaOCl in the bleach.
Epsom salts are hydrates of magnesium sulfate. The formula for Epsom salts is MgSO4 . xH2O. A 7.834g sample is heated until a constant mass of 3.825g is obtained, indicating that all the water has b
What is the normality of solution of potassium permaganate if 0.7778 grams of potassium chromate where used to make 0.05 liter of this solution.
Dissolved silica in river water can be determined by the formation of a green-yellow silicmolybdate complex and the comparison of its absorbance against a reference standard.
What should be the concentration of the potassium thiocyanate solution in order that each mL of solution correspond to exactly 1 mg of arsenic present?
At local coffee shop, you purchase a cup of coffee,but at 98.4 degree centigrade, it is too hot to drink.You add 23.0g of ice that is at -2.2degree centigrade, to 248mL of coffee.
Synthesize (3S,4R)-3,4-dibromo-1-cyclohexylpentane (and its enantiomer, since a racemic mixture will be formed) from ethyne, 1-chloro-2-cyclohexylethane, and bromomethane and any other reagents as
The aldol reaction is catalyzed by acid as well as by base. What is the reactive nucleophile in the acid-catalyzed aldol reaction? Propose a mechanism.
Assume that the heat required for the vaporization of the alcohol comes only from the aluminum block and that the alcohol vaporizes at 25 degrees Celsius. 1.04 gram of rubbing alcohol on 53 gram alu
A freshman studying medicine at an Ivy League College is a part of his class crew team and exercises regularly. After a particularly strenuous exercise session, he experiences severe cramps in his t
A standard solution prepared in the same fashion, containing 5.00 mL of 5.00 x 10-4 M Fe(ClO4)3 and the reagents (no sample) had an absorbance of 0.284.
If 1.50 m^3 of water at 0 degrees Celsius is frozen and cooled to -15 degrees Celsius by being in contact with a great deal of ice at -15 degrees Celsius, what would be the total change in entropy
A vessel having a volume of 10ft^3 contains 3.0 lbs of a liquid water and water vapor mixture and equilibrium at a pressure of 100 lbf/in^2. Calculate the volume and mass of liquid and the volume a
Calculate the frequency of the light emitted by a hydrogen atom during a transition of its electron from the n=4 to the n=1 principal energy level.
Suppose you dope that 1- cm^3 sample of silicon with 1 ppm of phosphorus that will increase the conductivity by a factor of a million. How many milligrams of phosphorus are required?
Tarnish is a result of silver metal reacting with oxygen in the air. You clean a tarnished teapot and then you weigh it. The teapot weighs 917 g.
25.00mLs of 0.04500M iron(III) chloride solution is tritrated with 0.02500M tin(II) chloride solution (both solutions are in 1M hydrochloric acid).
A brass sample weighing 0.6592g is dissolved using concentrated nitric acid, buffered to a pH of 9.0, and then diluted to 500.0mL with deionizred water.
What would be the titration error if the addition of the hydrchloric acid has stopped at the green color of the bromothymol blue endpoint (pH = 6.90)?
Can you draw out/picture a detailed SN2 mechanism of 1-butanol reacts with sulfuric acid and NaBr to get 1-bromobutane? What is the electrophilic carbon in the mechanism?