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A 50.0 mL sample containing Cd2 and Mn2 was treated with 69.6 mL of 0.0600 M EDTA. Titration of the excess unreacted EDTA required 11.9 mL of 0.0220 M Ca2 . The Cd2 was displaced from EDTA by the addition of an excess of CN-. Titration of the newly freed EDTA required 18.8 mL of 0.0220 M Ca2 . What were the molarities of Cd2 and Mn2 in the original solution?
Aerosol cans have a label that warns the user not to use them above a certain temperature and not to dispose of them by incineration. Even an empty can contains residual gaseous propellant.
He was surprised that most of the white solid melted sharply between 121 and 122 C but that a small amount remained unmelted even at temperatures above 200 C. Explain this behavior.
At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 11.8 g of biphenyl in 25.0 g of benzene
If the total pressure in the cylinder is 2490 mmHg, what is the partial pressure of each of the components? Assume constant temperature.
What is the sum of the stoichiometric coefficients when the reaction is balanced to lowest common denominator
A 270- mL flask contains pure helium at a pressure of 749 torr. A second flask with a volume of 470 mL contains pure argon at a pressure of 730 torr what is the partial pressure of He?
A 0.75-L bottle is cleaned, dried, and closed in a room where the air is 24°C and 50.% relative humidity (that is, the water vapor in the air is 0.5 of the equilibrium vapor
For each element listed below, determine the charge of the ion that is most likely to be formed and the identity of the noble gas whose electron configuration is acheived.
Two solution are mixed, Zn(NO3)2 and Na2CO3. If at the instant of mixing the [Zn(NO3)2]=3.7x10^-5M and [Na2co3]=1.5x10^-6M will a precipitate form?
The heat of reaction for the combustion of cyclohexane, C6H12, is 936.8 kcal/mol. What is the heat of combustion for cyclohexane in kcal/gram?
a solid acid is dissolved in enough water to make 200 ml of a solution. 40 ml of the solution is titrated to a phenolphthalein end point with an NaOH solution.
How much heat energy would be needed to raise the temperature of a 15.0 g sample of iron (C = 0.448 J/goC) from 22.0 oC to 100.0 oC?
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