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A reaction has a standard free-energy change of -12.30 kJ mol-1 (-2.940 kcal mol-1). Calculate the equilibrium constant for the reaction at 25 °C.
Recall "living" carbon samples show 15.3 d/min*g (carbon). note: CaCO3 is 12.00% carbon, and 14C has a half-life of 5730yr.
calculate the volume in ml of .500 M HA , .5ooM NaA , and water required to make 250 ml of a buffer with a total concentration
Inorganic phosphorous is spectrophotochemically measured in blood serum by formation of a reduced heteropoly acid (heteropoly blue) and comparison of its absorbance with a standard treated by the same procedure.
Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years. A rock is found to contain 84.3% of the am..
A cylinder contains 975 grams of chloroform, CHCl3, How many atoms of carbon are in the sample? How many atoms of chlorine are in the sample?
What is the solubility of MX3. MX3 M3+ + 3X1- (Ksp = 2.00e-09) a) in water solubility = M b) in 0.11 M KX solubility = M c) in 0.16 M M(NO3)3 solubility = M
Draw the Lewis structures and determine which of these molecules has a central atom that violates the octet rule. Please note that NO3 has an odd number of electrons. But you must decide where the missing electron will be. Does the central atom vi..
An aqueous solution was prepared to have a density of 1.54 g/mL and a molarity of 19.4 mol/L at 20oC. The molar mass, Mm, of the solute is 40.00 g/mol. What is the mass of the solvent?
A cylindrical glass tube 13.3 cm in length is filled with mercury ( density= 13.6 g/mL ). the mass of mercury needed to fill the tube is 107.5 g. calculate the inner diameter of the tube.
Wichita of the following can make a buffer system?
Write a net ionic equation for the reaction that occurs when zinc sulfide (s) and excess hydriodic acid (aq) are combined.
The Ka for boric acid is 7.3 x 10-10. What is the pKa of boric acid?
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