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A 2.30-g sample of a large biomolecule was dissolved in 25.0 g of carbon tetrachloride. The boiling point of this solution was determined to be 77.85°C. Calculate the molar mass of the biomolecule. For carbon tetrachloride, the boiling point constant is 5.03°C · kg/mol, and the boiling point of pure carbon tetrachloride is 76.50°C.
Explain the following: a.) The cycloheptatrienyl anion is antiaromatic, whereas the cyclononatetraenyl anion is planar (in spite of the angle stain involved) and appears to be aromatic. b.) Although
The solubility of Ag2CO3 in water is 2.58e-4 moles in 2 liters at 25 degrees celcius. What is the value of Ksp for Ag2CO3
Deuterium oxide (D20, where D is deuterium, the hydrogen-2 isotope) has an ion-product constant, kw1 of 8.9 x 10^-16 at 20 degrees Celsius. Calculate [D+] and [OD-] for pure (neutral) D20 at this temperature.
container at a temperature of 47C exerts a pressure of 6.3 atm. Calculate the number of moles in the sample
Using a Sample of 0.3991 grams of an unknown monoprotic acid, HA, which combines with Sodium hydroxide according to the balanced equation HA + NaOH ® NaA + H2O when 35.30 mL of 0.1086 M Sodium hydroxide is required to titrate the acid to the equiv..
A 1.8M solution of 65 mL is diluted to a volume of 248 mili litres. A portion of that solutions 124-mili litres is diluted using water of 137 mili litres. Determine the final concentration of this solution?
If the Km of the above enzyme is 12 mM, calculate the substrate concentration needed to achieve 40% of maximal velocity. Then what fraction of active sites are filled at 40% maximal velocity
chromium metal reacts with 3.807 g of iodine. Using the conservation of mass law, predict the mass of product.
Explain why alcohols such as ethanol and propanol are soluble in water, butanol is moderately soluble and pentanol is slightly soluble
Consider a sample that is a mixture composed of biphenyl, benzoic acid and benzyl alcohol. predict the order of elution oc the components in this mixture. assume that the chromatography uses silica column and the solvent system is based on cyclohe..
75.0 g of PCl5(g) is introduced into an evacuated 3.00 L vessel and allowed to reache equilibruim at 250 degrees celcius. PCl5(g) PCl3(g) + Cl2(g) Kp=1.80 for this reation, what is the total pressure inside the vessel at equilibrium
the carbonyl stretching frequency of aliphaticltbgt carboxylic acids in dilute solution is located near 1770cm. this
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