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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?
Which one of the following actions will cause an increase in the equilibrium concentration of NO(g) in a closed reaction chamber?
A 15 mL sample of a solution of Pb(ClO3)2 was diluted with water to 19 mL. A 15 mL sample of the dilute solution was found to contain 0.027 moles of Pb2+. What was the concentration of Pb(ClO3)2 in the original undiluted solution.
Calculate the number of moles of solute present in each of the following solutions.
Calculate the change in temperature for 4.5g of CaCl2 dissolved in 90.0mL of H20. Assume that calorimeter absorbs no heat. (Ccal=0)
A buffer (pH 3.70) was prepared by mixing 1.00 mole of formic acid and 1.00 mole of sodium formate to form an aqueous solution with a total volume of 1.00 L.
What is the solubility of Ca(OH)2 in water, at the experimental temperature, in grams of Ca(OH)2 per 100 mL of solution?
Potassium and oxygen gas react to form potassium oxide. b. Sodium and water react to form sodium hydroxide and hydrogen gas. c. Iron and oxygen gas react to form iron (III) oxide.
The precipitate that forms in the qualitative analysis of the chloride ions is AgCl. Calculate the mass of AgCl that should be produced when an excess of AgNO3 is reacted with 0.1900 g of [Co(NH3)5Cl]Cl2.
A cylinder with a piston contains 897 ml of dry oxygen at a pressure of 582 mm Hg and a temperature of 327 K. If the temperature is reduced to 286 K and the pressure increased to 628 mm Hg what is the new volume ?
A large cylinder of He gas,such as that used to inflate balloons,has a volume of 25.0 L at 22 Celsius and 5.6 atm. how many moles of He are in such a cylinder ?
a solution was prepared by mixing 50 ml of 0.100 M HCl with enough water to get 250 ml solution . what is the M of the final solution of hydrochloric acid?
a gas sample occupies 4.20 l under a pressure of 800 torr at 350K.At what temperature will it occupy 3.60 L at the same pressure?
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