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A spectrophotometer has a meter that gives a reading directly proportional to the amount of light reaching the detector. When the light source is off, the reading is zero. With the pure solvent in the light path, the meter reading is 78; with a 0.1 M solution of a solute in the same solvent, the meter reading is 55. The light path is 0.5 cm. Calculate the absorbance, the transmittance, and the molar absorption coefficient.
A Friede-Craft reaction. The reactants are tert butyl chloride and FeCl3. what would the arrow pushing mechanism and the product look like
Then 41.44 g of water, with an initial temp of 76.9 degrees celcius, was added to the calorimeter. The final temperature of the water in the calorimeter was 22.9 degrees celcius. what is the heat capacity of the calorimeter
when 1.50 l of 1.00 m na2so4 solution at 30.0 degrees celcuis is added to 1.50 l of 1.00 m bano32 solution at 30.0
a 255-ml flask contains pure helium at a pressure of 745 torr. a second flask with a volume of 455 ml contains pure
What is the freezing point of a solution of ethylene glycol (antifreeze), a nonelectrolyte, that contains 140. g of C2H6O2 dissolved in 290. g of water? Use molar masses with at least as many significant figures as the data given.
Classify each of the following binary compounds by the oxidation number of hydrogen. NH3 CaH2 MgH2 H2O HCl NaH H2 CH4
What types of intermolecular forces would you expect to exist among molecules of 1-butanol?
S8 also known as orthorhombic sulfur, what type of chemical bonds does S8 have? what type of crystal is this?
A piece of a newly synthesized material of mass 25.0 g at 80.0C is placed in a calorimeter containing 100.0 g of water at 20.0C. If the final temperature of the system is 24.0C, what is the specific heat capacity of this material?
Calculate the equilibrium constant Ksp for Mg(OH)2 (s) at 25 degrees celcius. Is the dissolution of Mg(OH)2 endothermic or exothermic
When X-rays with ? = 1.937 Å are used, the second-order Bragg reflection from a set of parallel planes in a(n) cesium crystal is observed at an angle
If it takes 66.8 min for the concentration of a reactant to drop to 20.0% of its initial value in a first-order reaction, what is the rate constant for the reaction in the units min-1?
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