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A kilogram of aluminum metal and a kilogram of water are each warmed to 75C and placed in two identical insulated containers. One hour later, the two containers are opened and the temperature of each substance is measured. The aluminum has cooled to 35C while the water has cooled only to 66 . C.Explain this difference.
What is the half-life of a compound if 80. percent of a given sample of the compound decomposes in 72 min? Assume first-order kinetics.
For any gas, the voulme the gas occupies is directly proportional to the number of moles of gas at a given temperature and pressure. Air is 21.0% (by volume) O2 How many moles of oxygen are present in 10.0 moles of air
What is the hydroxide-ion concentration of a 0.190 M oxalic acid, H2C2O4, solution? For oxalic acid, Ka1 = 5.6x10-2 and Ka2 = 5.1x10-5.
At 55.0 degrees C, what is the vapor pressure of a solution prepared by dissolving 75.8 g of LiF in 259 g of water? The vapor pressure of water at 55.0 degrees C is 118 mmHg. Assume complete dissociation of the solute.
Calculate the change in ph when 6 ml of 0.1 M HCl is added to 100 ml of a buffer solution that is 0.1 M in NH3 and 0.1 M in NH4Cl.
An electron in the ground-state He+ ion undergoes a transition to a state described by the wavefunction R4,1(r)Y1,1(?,). (a) Describe the transition using term symbols. (b) Compute the wavelength, frequency, and wavenumber of the transition.
How many grams of the K2C2O4 X H2O in the salt mixture remain unreacted (in excess)? f. what is the percent by mass of each salt in the mixture
You are given 100 mL of a colorless aqueous solution. How would you determine if the solution is a buffer solution. State what you would need (if anything) in addition to the suspected buffer solution, state what you would do, and how you would de..
The fuel used in many disposable lighters is liquid butane C4H10 How many carbon atoms
Solid NaI is slowly added to a solution that is 0.0091 M Cu+ and 0.0077 M Ag+. Calculate the concentration of Ag+ when CuI
Compare the IR spectra of cinnamyl alcohol and cinnamaldehyde. What is the major difference
The precipitate was filtered, dried, and weighed. A total of 1.55 g calcium flouride was collected. What was the percentage of CsF in the original sample.
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