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The specific heat of toluene, C7H8, is 1.13 J/g K. How many joules of heat are needed to raise the temperature of 50.0 g of toluene from 12.0°C to 30°C?
A point mass rotates in a circle with l = 1. Calculate the magnitude of its angular momentum and the possible projections of the angular momentum on an arbitrary axis.
The solubility of ammonium chloride at 30.0 C is 41.1 g per 100 g of water. what is the maximum amount in grams of ammonium chloride that will dissolve in 4455.0 g of water at this temperture?
The rate constant for this reaction is 3.0 X 102 s-1. How long does it take for the concentration of N2O4 to change from 1.000 M to 0.125 M?
A .900g sample of water is injected into a 10.0 liter flask at 55 degrees C. How much H2O (l) remains if any, remains in the flask once equilibrium is reached? The vapor pressure of water at 55 C is
Question: A bag contains ten counters, of which six are red and four are green. A count is chosen at random; its colour is noted and it is replaced in the bag. A sound counter is then chosen at rand
An aqueous CaCl2 solution has a vapor pressure of 83.0 mmHg at 50 degrees celsius. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass perce
When Dr. Farrell was a graduate student, he once made up a pH 8.0 sodium acetate buffer. Why would the casual observer to this buffering faux pas come tot eh conclusion that he had the intellectual
You require a buffer with pH of 4.50. You have 1.00L of a solution of 1.80M acetic acid. How many grams of solid sodium acetate (NaC2H3O2, molar mass 82.0g/mol) must be added to give the pH of 4.50?
Assume you completely hydrolyze a sample of the peptide Phe-Val-Lys-Ser using the appropriate protease in a phosphate buffer solution at pH=7. What two species would actually constitute the phosphat
The Mn is clearly reduced and is the oxiding agent; how do you decide whether the H or the Fe is being oxidized? They both lose electrons.
A scientist wants to make a solution of tribasic sodium phosphate, Na_3PO_4, for a laboratory experiment. How many grams of Na_3PO_4 will be needed to produce 525 mL of a solution that has a concen
By titration it is found that 27.5 mL of 0.155 M NaOH (aq) are required to neutralize 25.0 mL of HCl (aq). Calculate the concentration of the hydrochloric acid solution.
Compute the theoretical yield of the product (in moles) for each initial amount of reactants.
Estimate the effective nuclear charge for an n=1 n=2 n=3 electron in sulfur. show steps.
Question: Commercial grade HCl solutions are 39% by mass with a density of 1.20 g/ml. What is the molality of the solution?
Calculate the initial velocity of a reaction if the substrate concentration is 4 times the Km, show calculations.
Assuming that the combustion of palmitic acid gives off 10126.9 kJ/mol what is the maximum number of ATP molecules that can be generated from ADP and Pi, by combusting one palmitic acid molecule?
Calculate the initial velocity of a reaction in terms of V max if the substrate concentration is 1/2 the Km. Show the calculations.
The average distance between base pairs measured parallel to the axis of a DNA molecule is 3.4 A. The average molar mass of a pair of nucleotides is 650 g/mol. Estimate the length in centimeters of
List at least four themes by which enzymes interact with substrate to lower the transition state energy.
What is the empirical formula of a compound that has three times as many hydrogen atoms as carbon atoms, but only half as many oxygen atoms as carbon atoms?
The alcohol content of hard liquor is normally given in terms of the "proof," which is defined as twice the percentage by volume of ethanol (C2H5OH) present. Calculate the number of grams of alcoho
What would you expect to happen if you combined 1o.0mL of10mL of 10^-2 M acetic acid qand 5.0 mL of10^-2 M sodium hydroxide? What would be the concentrations of acetic acid and sodium acetate in thi
What is w per mole for a reversible isothermal expansion of an ethane from 5-10 L/mol at 298k assuming ethane is an ideal gas and it follows the Van der Waals equation?