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How would the Rf values change if you used pure dichloromethane ( no methanol ) as the mobile phase for the TLC separation of curcumin? What if you used pure methanol ( no dichloromethane)?
Liquid benzene, C6H6, (density = 0.877 g/mL) can be used as a fuel. What is ?H in kJ for the combustion of 2.86 L of benzene producing CO2(g) and H2O. Assume that the heat of combustion of benzene is -4.18 x 103 kJ/mol.
Calculate the wavelength at which they are broadcasting.
How many grams of diphenyl (C 12H10) must be dissolved in 655 g of benzene to lower the freezing point by 3 .20ºC.
How many grams of Potassium Chlorate decompose to passium chloride and 638mL of O2 at 128 degrees C and 752 Torr. 2KClO3 (s) => 2KCl (s) + 3O2(g)
The most common source of copper (Cu) is the mineral chalcopyrite (CuFeS2). How many kilograms of chalcopyrite must be mined to obtain 355g of pure Cu
In the titration of a monoprotic acid with a solution of sodium hydroxide of known concentration, what quantities are equal at the equivalence point
The following compounds undergo McLafferty rearrangement in the mass spectrometer. Predict the masses of the resulting charged fragments for each of the following compound.
What is the molarity of a solution prepared by dissolving 72.0 g of HCI in enough water to make 500 ml of solution.
If a bottle of nail polish remover contains 175mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788g/ML.
Balance the equation for the reaction of sodium metal with water to produce aque- ous sodium hydroxide and hydrogen gas carbon. The products of this reaction are tin and carbon dioxide. When the equation is written and balanced, what is the coeffi..
An aqueous solution is 5.50 % by mass ammonia, NH3, and has a density of 0.975 g/mL. What is the mole fraction of ammonia in the solution?
Assume that the specific heat and density of the resulting solution are equal to those of water [4.18 rm J/(g cdot {^circ C}) and 1.00 rm g/mL] and that no heat is lost to the calorimeter itself, nor to the surroundings.
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