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In an excess of NH3 (aq), Cu^2+ forms a deep blue complex ion, Cu(NH3)4^2+ , which has a formation constant Kf= 5.6*10^11. Calculate the concentration of Cu^2+ in a solution prepared by adding 4.8*10^-3 mol of CuSO4 to 0.550 L of 0.35 M NH3.
Suppose that a 25-mL sample of a solution is to be tested for I- ion by addition of 1 drop (0.20 mL) of 0.27 M Pb(NO3)2. What is the minimum number of grams of I- that must be present
The following results were obtained for the determination of sulfur in a coal sample. The average for 4 trials was 1.94 %S with a standard deviation of 0.04 %S. Based on these data, report the 95% confidence limits for the average sulfur content.
What absorbance would be obtained for a solution that has an absorptivity of 4700 L/mol*cm for a 1.5x10^-4 solution in a 1.0 cm cell? What would the percent transmittance (100*I/Io) be
a solution is prepared from 2.50 g of an unknown compound and 25.0 g of benzene c6h6. the freezing point of this
how many mols of H 2 can produce
The C^14 decay rate for the sample of glue was found to be 5.60d/min/g. What is the approximate age of the glue. Disintegration of C^14 is a first order process with a rate constant 1.209*10^-4 year^-1.
If all the energy obtained from burning 1.16 pounds of propane is used to heat water, how many kilograms of water can be heated from 24.8 degrees celsius to 43.6 degrees celsius
A xenon fluoride compound can be prepared by heating a mixture of Xe and F2 to a high temperature in a pressure- proof container made of nickel.
Benzene is a organic solvent with the formula, The volume occupied by 1 micromole of liquid benzene and the volume occupied by 1 megamole of benzene as a vapor at STP (assume an ideal gas)
Calculate the work in kilojoules done during a synthesis of ammonia in which the volume contracts from 8.8L to 4.3L at a constant external pressure of 46 atm
A sealed tube contains 1.66 atm PCl5 at 500 K. The PCl5 decomposes until equilibrium is established. The equilibrium pressure in the tube is 2.28 atm. Calculate Kp for this equilibrium.
Calculate the molar mass of a gas that has a density of 143 g/mL at 23 degrees celcius and a pressue
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