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The mass spectrum of an organic compound shows the relative abundances of M to be 38.82% and M 1 to be 7.977%. Assuming the peaks are caused by 12C and 13C isotopes, determine the number of carbon atoms in the compound. Natural abundances: 12C is 98.93% and 13C is 1.07%
Unfold the enzyme with urea and 2-mercaptoethanol. Then incubate and crystallize it in the presence of the substrate followed by X-ray crystallography.
You add 1.00 g of a solid weak acid to 100 mL of water, then titrate with 0.100 M NaOH solution. The pH at the half equivalence point is 4.22. Which of the acids in the Weak Acid Equilibrium Constant table most likely matches your unknown?
The equilibrium constant, Kp , for the reaction CO(g) + H2O(g)-> CO2(g) + H2(g) at 986°C is 0.63. A rigid cylinder at that temperature contains 1.2 atm of carbon monoxide, 0.20 atm of water vapor
Calculate the wavelength, in naniometers, of the spectral line produced when an electron in a hydrogen atom undergoes
Substituents on an aromatic ring can have several effects on electrophilic aromatic substitution reactions. Substituents can activate or deactivate the ring to substitution, donate or withdraw electrons inductively
Find H+ and the pH of the following solutions a) .30M HBr b) a solution made by diluting 10.0 mL of 6.00 M HCl to .300 L with water
Quicklime (CaO) is produced by thermal decomposition of calcium carbonate(CaCO3). Calculate the volume of CO2 at STP produced form the decomposition of 146 g CaCO3 by the reaction: CaCO3(s) -> CaO(s) + CO2(g)
A cylinder, with a piston pressing down with a constant pressure, is filled with 1.90 mole of a gas (), and its volume is 40.0 liter (). If 0.400mole of gas leak out, and the pressure and temperature remain the same, what is the final volume of th..
The following problem is based on the "Nutrition Facts" found on the wrapper of an energy bar, assuming a 2000 calorie diet. The energy bar contains 100 mg of sodium, which constitutes
some gas is expelled from the bottle from the process. When P = P(external), the stopper is quickly replaced. The gas remaining in the bottle slowly warms up to 285K. what is the final pressure in the bottle for a monatomic gas for which C(v,m) = ..
A solution of 0.01M acetic acid is found to have a PH of 3.63 . Calculate the Ka for the acid
A solution of sulfuric acid is prepared by mixing 66.7 mL of 18.0 M sulfuric acid with 233.3 mL of 1.50 M sulfuric acid, and diluting with water to the total volume of 500 mL. What is the molarity of the final solution
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