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A 2.39-mg sample of safrole was dissolved in 103.0 mg of diphenyl ether. The solution had a melting point of 25.70 C. Calculate the molecular mass of safrole. The freezing point of pure diphenyl ether is 26.84 C, and the freezing-point depression constant, Kf, is 8.00 C/m.
Determine the minimum excitation energy of an electron constrained to rotate in a circle of radius equal to the Bohr radius (the value of Bohr predicts for the electron-hydrogen distance in the n=1 state) around a fixed point.
Calculate the molarity of sodium ions in a solution made by diluting 50.0 mL of 0.874 M sodium sulfide solution to a total volume of 250.0 mL
The maximum # of stereoisomers that are possible for a given molecule can be determined from the formula, 2^n, where n is the nubmer of stereocenters in the molecule.
a solid block of exactly 100.0 cm has a mass of 153.6g. Determine its density. Will the block sink or float on water.
A balloon has a volume of 1.20 L at 24.0oC. The balloon is heated to 48.0oC. Calculate the new volume of the balloon.
Suppose 2 atm of SO2 reacts, what will be the resulting pressures? Suppose 2 atm of SO2 reacts, what will be the resulting pressures?
100 mL of 0.150 M acid H2A are mixed with 100 mL of 0.1600 M NaOH. Calculate the [H+] of the resulting solution at equilibrium. Ka1 = 1.0 x 10^-5 Ka2 = 1.0 x 10^-7
A student measures the standard enthalpy change for reaction (C2H4(g) + H2O(g) CH3CH2OH(g)) to be -52.8 kJ :Calculate the standard enthalpy of formation.
Assume equilibrium with the calcium carbonate in the sediment and calculate the concentration of calcium ion
Copper is obtained from ores containing the minerals, azurite,Cu3(CO3)(OH)2, chalcocite, Cu2S, chalcopyrite CuFeS2
Prepare 2.0 L of 0.02 M acetic acid from 4.0 M acetic acid and nanopure water. How many L or mL do you need to make this
The partial pressures of PCL5, PCl3, and Cl2 are .875 atm, .463 atm, and 1.98 atm. What is the value of equilibrium constant?
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