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A star has a mass of 2.04 1030 kg, three-quarters of which is hydrogen. The mass of a hydrogen atom is 1.67 10-27 kg. How many hydrogen atoms does the Sun contain? Use powers-of-ten notation.
What is the band gap energy in kilojoules per mole if bule diamonds absorb orange light with a wavelength of 675nm
A compound A(C6H6) undergoes catalytic hydrogenation over lindlar catalyst to give a compound B, which in turn undergoes ozonolysis followed by workup with aqueous H2O2 to yield succinic acid and two equivalents of formic acid.
The difference in the mercury levels in the two arms of the manometer was 11.8 cm. Atmospheric pressure was 783 mm Hg. The pressure of the argon in the container was __________ mm Hg.
A reaction is stereoselective when one stereoisomer is formed more than another.
At body temperature 37 C, Ka for aspirin equals 3 x10^ - 5.If two aspirin tablets, each having a mass of 325 mg, are dissolved in a full stomach whose volume is 1 L and whose pH is 2, what percent of the aspirin is in the form of neutral molecules
Suppose that you have a 2.0 L sample of hydrogen at 1.00 atm and 59°C. If you heat the sample to 84°C and it expands to a volume of 3.7 L, what will the final pressure be?
Many pharmeceuticals are derived from piperazine. solutions of piperazine are basic (Kb1=5.38x10^-6, Kb2=2.15x10^-9). What is the pH of a 0.0185 M solution of piperazine. For this problem assume it is ok to have up to a 10 percent error in our "si..
Water solubilities of oxalic acid and sodium oxalate at RT are 10g/100 ml and 3.7 g/100 ml respectively. Could you prepare oxalic acid by adding HCl to a solution of sodium oxalate, cooling it to room temperature, and filtering the resulting mixtu..
The specific heat of aluminum is 0.21 cal g°C. How much heat is released when a 10 gram piece of aluminum foil is taken out of the oven and cools from 50 to 10 °C?
Calculate the total pressure (in atm) in the tank at 25°C. First need to calculate the number of moles of each gas added.
Intramolecular forces refer to the bonding forces within a molecule. Choose which forces are involved in the following change. those allowing fog to form on a cool, humid evening in Houston a. intramolecular b. intermolecular c. both d. neither
An aqueous solution of an acid HX has a pH of 5.34,what is the value of Ka for HX and calculate the percentage dissociation of HX in the solution
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