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Compute how many milliliters of 0.100 M HCl should be added to 25.0 ml of a 0.200 M solution of NH3 to prepare a buffer that has a pH of 8.80? Kb = 1.76x105
Calculate the heat released when 206 g of ice cooled from 0 degrees C to -10 degrees C. (The specific heat of ice is 2.09 J/g. C)
a 25.00-ml sample of orange drink with 2 g of ki and 25.00 ml of 0.0131 m kio3 added was back-titrated with a 0.0302 m
Calculate the rate constant of the catalyzed and uncatalyzed reactions. How many folds of rate enhancement are produced by the enzyme? The rate constant is 13.46 but what is the nuber of folds of enhancement that are produced by the enzyme?
need down wind concentrations for a dirty bomb dust cloud that carries toward a nearby downtown area on a light wind
If 14.0 mL of a 0.742 M solution of barium hydroxide is mixed with 25.9 mL of a 0.724 M solution of phosphoric acid, and 1.98 g of solid barium phosphate is collected once the reaction is complete, what is the percent yield of the reaction
A freezing point of -5.20?C is recorded for a solution made by dissolving 10.56 g of the compound in 25.0 g of water. Determine the molar mass, and molecular formula of the compound. Assume that the compound is a nonelectrolyte.
A sample of chlorine has two naturally occuring isotopes, the isotope Cl-35 makes up 75.8% of the sample, and the isotope cl-37 makes up 24.3 of the sample. Which of the following statements is true
An electrochemical cell is constructed with a zinc metal anode in contact with a 0.0520M solution of zinc(II) nitrate and a silver cathode in contact with a 0.00420M solution of silver(I) nitrate
A helium-filled weather balloon has a volume of 2.4 × 102 L at 99 kPa pressure and a temperature of 0°C. What is the mass of the helium in the balloon?
The delta G for the freezing of at -10 C is -210 J/mo and the heat of fusion of ice at this temperature is 5610 J/mol. Find the entropy change of the universe when 3 mol of water freezes at -10 C.
a gas sample containing 1.50 mol at 25 exerts a pressure of 400 torr. some gas is added to the same container and the temperature increased to 50 C. If the pressure increases to 800. torr, how man moles of gas were added to the container? assume a..
Calculate the final temperature of 34mL of ethanol initially at 20celcuis upon absorption of 739 J of heat. (density of ethanol =0.789g/mL )
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