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Assume that you have a small amount (< 3mg) of crystals that formed from a recrystallation with 1 mL of solvent. To isolate the crystals, the best technique would be to:
a) gravity filtration using a funnelb) using a pipette with the cotton in the tipc) using a pipette with cotton at the neckd) evaporating the solvent
The total molarity of acid and conjugate base in this buffer is .100 M. A student adds 7.10 mL of a .250 M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760
Draw the skeletal structure of the major organic product resulting from the following reaction. (All hydrogen atoms are implied, but any deuterium isotopes must be shown where appropriate.)
determine the molar mass of the substance if 120.0 grams of a pure sample contained 24.0 mol of the substance. express
Determine what is the percent yield of the reaction If 15.0 grams of Nitrogen and 2.00 grams Hydrogen react to produce 1.38 grams of Ammonia?
what is the molar concentration of the salt solution formed in this reaction? 3. what is the molar concentration of the excess reactant once this reaction has finished?
When runners or other athletes practice at high altitudes pressure is reduced. What then will be the effect on the [O2] in their blood? Why does this produce a lightheaded feeling?
a tank contains helium at 490 mmHg, nitrogen gas at 0.750 atm, and neon at 520 torr. what is the total pressure in atm?
The final temperature is 27.06 C. Assume the volumes are additive, the specific heat of the solution is 4.180 J g/C, and that the density of the solution is 1.00 g mL -1. Calculate the enthalpy change, delta H, in kj for the reaction: HBr (aq) +Na..
The density of a 0.438 solution of potassium chromate at 298 is 1.063 .Calculate the vapor pressure of water above the solution. The vapor pressure of pure water at this temperature is 0.0313 . Assume complete dissociation.
Illustrate the structures of the 6 bromoalkenes (with the molecular formula C5H9Br ) that have a branched C chain, and that show neither chirality nor E,Z isomerism.
The endpoint in the titration is "overshot" A. is the reported molar concentration of the hydrochloric acid solution too high or too low. B. As a result of this poor titration technique, is the reported number of moles of B4O5(OH)4^2 would be too ..
Calculate the amount of energy released by the freezing of 13.3 g of a liquid substance, given that the substance has a molar mass of 82.9 g/mol and a molar heat of fusion of 4.60 kj/mol.
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