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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.
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
The edge of a body-centered-cubic unit cell of an element Y was found to be 3.16 x 10^-8 cm. The density of the metal is 19.35 g*cm^-3. What is the approximate molar mass of Y?
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.
A 500 mL gas sample is collected over water at a pressure of 740 mmHg and 25 Celsius. What is the volume of the dry gas at STP? (Vapor Pressure of H2O at 25 C is 24 mmHg)
If the concentration of Hydrogen gas (H2) in the equilibrium mixture is 0.426 M, what mass of Methanol was initially introduced into the vessel?
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
A 3.23 gram sample of a sodium bicarbonate mixture was reacted with excess acid. 48.52 mL of the evolved gas was collected over the water at 0.930 atm and 23.0 degrees Celsius. What is the percenta
Molar absorbtivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are εCo = 36,400 and εNi= 5520 at 510nm and εCo= 1240 and εNi= 17,500 at 656nm
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 sodium thiosulfate solution in order that each mL of the solution correspond to exactly 10 mg of the hydrogen peroxide solution?
Calculate the molar mass of the organic base. A second 0.5155g sample of the weak base is carefully neutralized with the standard acid solution. The solution pH is then found to be 2.750.
A pigment suspected of being contaminated with arsenic is treated to convert any arsenic present into a solution of arsenic acid. The solution is then treated with an excess of silver nitrate and a
Exactly 1.000L each of hydrochloric acid and sodium hydroxide solutions are standardized as follows: 0.7982g of dried potassium hydrogen phthalate is dissolved in 125mLs of water and then titrated t
A 1.800 g sample of phenol (C6H5OH) was burned in a bomb calorimeter. The calorimeter contains 1250 g of water and the bomb has a heat capacity of 6430 J/K. What is the heat of combustion per mole
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.What is the final
Given that energy differences btwn two staggered conformations of 1-bromopropane is 1.4 kj/mol, that the energy difference between two staggered conformations of 1,2-dibromoethane is 0.4kj/mol.
How many atoms of iodine are in .500 moles of Ca(IO3)2? How many grams of calcium iodate are needed to supply this much iodine?
In the process, three evaporators are used in series to reduce the water level of an incoming brine solution which contains 25% NaCl and 75% water.
Calculate the reaction Gibbs energy in a mixture consisting of 0.15 mol of borneol and 0.30 mol of isoborneol when the total pressure is 600 Torr.
A mixture of gaseous oxygen and nitrogen is stored at atmospheric pressure in a 3.7 l iron conatianer maintained at constant temperture.After all the oxygen has reacted with the iron walls of the c
A mixture of aluminum and zinc has a mass 2.30g. Excess HCl is added to the mixture and 2.30L of H2 (hydrogen gas) was produced at a pressure of 1.10 atmospheres and a temperature of 25 degrees Cels
Determine the blood volume of a Rabbit from the following data. A 2.8 ml volume of radioactive plasma with a activity of 5.60 x 10 4 dpm is injected into the blood steam. Later a 1.4 ml sample of bl
How many times larger is the spacing between the energy levels with n=3 and n=4 than the spacing between the energy levels n=8 and n=9 for the one electron beryllium species?