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Use the Boltzmann equation to calculate the excited-state and ground-state population ratio for HCl (g*/g0=1) at room temperature (25 oC). The frequency of the absorption from the ground to the excited state is 2885 cm-1. What is the population ratio when temperature goes up to 50 oC?
Calculate the amount of heat required to completely sublime 53.0 g of solid dry ice CO_2 at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3
the sandals in disintegrations per minute per gram? Assume the original activity was 15.3 disintegrations per minute per gram.
The nitration of toluene gives o- and p-nitrotoluene as the major products. Please explain this observation, using structures (rather than words) as much as possible.
A student combusts 504.96 grams of ethene gas, C2H4. How many liters of CO2 (g) are produced at a pressure of 0.993 atm and a temperature of 295 K? C2H4 (g) + 3 O2 (g)-> 2 CO2 (g) + 2 H2O (g)
You have a solution of 0.085 M HNO2 and 0.15 M KNO2 (Ka for HNO2 = 4.5 * 10-4) what is the pH
Gas phase irridation of 2-pentanone produces acetone and ethylene in about 90% yield along with 10% 1-methylcyclobutanone. Accoutnt for the formation of these three products
How many hemoglobin molecules are there in an average red cell? Assume that the molecular weight of the human hemoglobin tetramer is 65 kd. (The answer is 2.74x10^8, but I don't know how to calculate it)
there are two natuarlly occuring isotopes of rubidum. (85)Rb has a mass of84.9118 amu. (87)Rb has a mass of 86.9092 amu. Determine the abundance of each isotpe.
A cylinder is labeled "PENTANE." When the gas inside the cylinder is monochlorinated, five isomers of formula C5H11Cl result. Was the gas pure n-pentane, pure isopentane, pure neopentane
A 0.00445 mol sample of a weak acid, HY, is dissolved in enough water to form 0.0976 L of solution. If the pH of the solution is 4.02, what is the Ka of HY? Use E notation with 3 significant figures.
Calculate the pH of a solution made by adding 51 g of sodium acetate, NaCH3COO, to 18 g of acetic acid, CH3COOH, and dissolving in water to make 700. mL of solution. Hint given in feedback.
SO2 present in air can be analyzed by titraion with permangante ions, as described in the equation:
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