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1) How many kilograms of magnesium can be obtained from 5.96 km^3 of seawater if the initial Mg^2+ concentration is .19% by mass. Remember the density of seawater is 1.04 g/ml
2) how many grams of MgCl2 must dissolve to equal the ion concentration of 62.3 grams of NaCl? also how many grams of CaS must dissolve?
3) find the ph of two equivalence points and the volume (ml) of .407 M HNO3 needed to reach them in the titration of .188 L of .250 M ethylenediamine(H2NCH2CH2NH2)
first equiv point___ ph____ 2nd equiv point___ ph___
4) what volumes of .200 M HCOOH and 2.0 M NaOH would make .450 L of a buffer with the same ph as a buffer made from 475 ml of .2 M benzoic acid and 25 ml of 2.0 M NaOH?
What volume of ethylene glycol (C2H6O2), a nonelectrolyte, must be added to 12.7 L of water to produce an antifreeze solution with a freezing point of -34.6°C? (The density of ethylene glycol is 1.11 g/cm3, and the density of water is 1.00 g/cm3.)
What does the 1H-NMR spectrum and the IR spectrum look like with notations on each peak on both spectra
Arrange the descriptions in order of increasing number of microstates in the resulting system.
4-methoxybenzoic acid is a weaker acid than benzoic acid, but methoxyacetic acid is a stronger acid than acetic acid. Explain this apparent contradiction.
Assume also that on a yearly basis the lake is completely mixed, and that the small river flowing into and out of the lake can be neglected as far as acidification is concerned. How many years will it be before the lake will reach a pH of 5.0?
the density of titanium is 7.51 g/cm^3. What is the volume (in cubic inches) of 3.5 lb of titanium?
Use the Henderson-Hasselbalch equation to calculate the of each solution: a solution that contains 0.600% C5H5N by mass and 0.960%
A solution of ethanol (C2H5OH) in water is prepared by dissolving 69.8 mL of ethanol (density = 0.79 g/cm3) in enough water to make 250.0 mL of solution. What is the molarity of the ethanol in this solution?
A 3.140 molal solution of NaCl is prepared. How many grams of NaCl are present in a sample containing 2.678 kg of water?
suppose you want to find out how many milliliters of 1.0 M AgNO3 are needed to provide 169.9g of pure AgNO3.
Explain why the rates of diffusion of nitrogen gas and carbon monoxide are almost identical at the same temperature.
In a coffee-cup calorimeter, 1.50 g of NH4NO3 is mixed with 76.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.65°C.
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