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1) A 290 mL stock solution contains 2.3 M Ca(CN)2. When 100 mL of the stock solution is diluted to 125 mL, how many moles of CN- ions will be contained in the dilute solution?
2) A 130 mL stock solution contains 1.5 M CuF2. When 15 mL of the stock solution is diluted to 23 mL, what will the concentration of F- ions be?
3) A stock solution is prepared by adding 25 mL of 1.7 M Na2SO4 to enough water to make 40 mL. How many moles of Na+ are in 10 mL of the stock solution?
4) A stock solution is prepared by adding 25 mL of 1.4 M Pb(ClO3)2 to enough water to make 57 mL. How many moles of ClO3- are in 30 mL of the stock solution?
5) How many milliliters of a 95 mL solution of 1.5 M K2SO4 must be used to make 65 mL of a solution that has a concentration of .71 M K+?
6) A 13 mL sample of a solution of Pb(ClO3)2 was diluted with water to 21 mL. A 15 mL sample of the dilute solution was found to contain 0.025 moles of Pb2+. What was the concentration of Pb(ClO3)2 in the original undiluted solution?
7) What is being calculated when the molarity of the solute in a solution is divided into the moles of a solute in the solution?
The enthalpy of formation of ethanol, C2H5OH, is 277.o kJ/mol at 298.15K. Calculate the enthalpy of combustion of one mole of ethanol, assuming that the products are CO2 and H2O.
A buffer is made by dissolving HC2H3O2 and NaC2H3O2 in water. Write an equation that shows how this buffer neutralizes added: Acid, Base
A solution of NaOH(aq) contains 7.4 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.
Draw an oxygen saturation curve for a cooperative protein that shows a p50 of 45 torr. On the same graph draw a c curve that shows a protein that is non-cooperative with p50 of 15 torr
The pressure inside a hydrogen-filled container was 2.10 atm at 21 C. What would the pressure be if the container was heated to 94 C?
Suppose the reaction Ca3(PO4)2 + 3H2SO4 ------ > 3CaSO4 + 2H3PO4 is carried out starting with 103 g of Ca3(PO4)2 and 33.7 g of H2SO4. How much phosphoric acid (H3PO4) will be produced?
What is the balanced equation for the Magtrieve Oxidation of 4-Cholorbenzyl alcohol to 4-chlorobenzaldehyde? If 1 mmol of 4-chlorobenzyl alcohol and 700 mg of Magtrieve are used
What is the pH of a buffer prepared by adding 0.45 mol of the waek acid HA to 0.608 mol of NaA in 2.00 L of solution? The dissociation constant Ka of HA is 5.66e-7
what is the maximum mass of product (oil of wintergreen) that could be formed? The density of methanol is 0.791 g/mL.Give your answer in grams with 3 significant figures.
the appropriate number of significant figures. Use leading zeros if appropriate.
Calculate the grams of solute needed to prepare each of the following solutions. Express the answer using 2 sig figures.
A 0.4780-g sample of impure Ca(OH)2 is dissolved in enough water to make 57.00 mL of solution. 20.00 mL of the resulting solution is then titrated with 0.1140-M HCl.
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