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Why does CH3-CH2-O-H have a higher boiling point than CH3-O-CH3 even though they have the same molar mass?
Lithium nitride can be produced by the reaction below. If the percent yield for this reaction is 28.63%, how much lithium would be required to actually produce 5.892g of lithium nitride?
Literally, the pH measurement is the electrochemical cell potential measurement. Can one use a normal multimeter to measure the cell potential and then convert it to solution pH? Why?
The first line of the Balmer series occurs at a wavelength of 656.3 nm. What is the energy difference between the two energy levels involved in the emission that results in this spectral line?
The solubility of nitrogen in water exposed to the atmosphere, where the partial pressure of nitrogen is 593 mm, is 5.3 X 10-4 At the same temperature, what would be the solubility of pure nitrogen, a
Calculate the vapor pressure at 25 degrees C of an aqueous solution that is 5.50% NaCl by mass. The pure vapor pressure of water at this temperature is 23.78 torr.
A weather balloon is filled with 15.0 liters of helium at 27 degree Celsius and 0.99 atm. What volume does the balloon have when it has risen to a point in the atmosphere where the pressure is 45 to
Air initially occupying 1 m3 at 150 kPa, 20°C undergoes an internally reversible compression during which PV^n = constant to a final state where the pressure is 600 kPa and the temperature is 12
A certain first-order reaction has a rate constant of 2.75 x 10-2s-1 at 20oC. What is the value of k at 60oC if E = 105 kJ/mol?
Covalent modification of enzymes is an important means of regulation. Explain the steps by which phosphorylation decreases the rate of formation of pyruvate from phosphoenolpyruvate in the Liver.
Divers often inflate heavy duty balloons attached to salvage items on the sea floor. If a balloon is filled to a volume of 3.00 L at a pressure of 2.50 atm, what is the volume of the balloon when it
If an excess of 2.45 M HCL is used with 12.75 g of sodium bicarbonate at 732 torr and 38 C, what volume of carbon dioxide is obtained?
The initial volume of a gas cylinder is 750.0 mL. If the pressure of a gas inside the cylinder changes from 840.0 mmhg to 360 mm hg , what is the final volume the gas occupies?
When 0.629 g of Na3PO4*12H2O (molar mass = 380.12g/mol) and 0.527g of BaCl2*2H2O (molar mass = 244.30g/mol) are mixed with water forming 500ml of solution, how many grams of Ba3(PO4)2 (molar mass = 60
Why is it necessary to heat the obtained mixture of tea leaves in water when conducting the experiment to extract caffeine from tea leaves?
Consider the reaction of sulphuric acid, H2SO4, with sodium hydroxide, NaOH.
At the boiling point of water,the Fahrenheit temperature is 112 degrees higher than the Celsius value. At the the freezing point the difference is only 32 degrees. At what temperature do both scales
Calculate the theoretical mass of hydrogen chloride formed in the reaction of sulfuric acid 2.00 mol with sodium chloride 150 g. Hydrogen chloride can be prepared by the following reaction:
Explain why the separatory funnel should not be shaken after adding sodium carbonate in a caffeine-extraction-from-tea-leaves lab?
Calculate the density of vanadium which crystallizes in a body centered cubic lattice, the length of the edge of a unit cell being 300 pm.
Gallium arsenide is a common semiconductor. This material becomes a conductor when irradiated with infrared light whose frequency is 3.43 × 1014 s-1. Calculate the band gap of GaAs in kJ/mol.
A KCl solution is prepared by dissolving 25.0 g KCl in 250.0 g of water at 25°C. What is the vapor pressure of the solution if the vapor pressure of water at 25°C is 23.76 mm Hg?
0.100 moles of NaOH are combined with 0.125 moles acetic acid. the mixture is taken to a final volume of 100.0ml. what is the expected pH of the solution?
Describe the difference between the temperature vs time cooling curve of a pure substance and a solution.
Briefly, explain how to make an acetic acid/ acetate buffer? Give the chemical reaction between this buffer and a small addition of base (OH-), which explains why the pH of the solution remains abou