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Which of the following groups would have the highest priority in determining R and S? a) CH2CH2OH b) CH(CH3)2 c) CH2CH3 d) CH2C(CH3)3
two naturally occurring isotopes, Re-185 (mass = 184.935 amu) and Re-187 (mass = 186.956 amu). Calculate the percent abundances of the isotopes of rhenium.
Synthetic polypeptides can assume an helical structure under appropriate conditions. Indicate whether polylysine and polyglutamate form an helix or a disordered structure at the indicated pH values.
The flask shown here contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 0.300 M NaOH. B. What was the initial concentration of HCl?
a cylindrical glass tube 15cm in length is filled with ethanol. The mass of ethanol needed to fill the tube is found to be 9.64g. Calculate the inner diameter of the tube in centimeters. The density of ethanol is 0.789 g/mL
The measured boiling point of the solution was 65.46 °C. Calculate the molecular weight of the unknown substance.
times that of nitrogen gas ( at the same temperature). calculate the molar mass of the unknown gas in g/mol?
If the heat capacity of the calorimeter was 25 J/C, what would the change in enthalpy (delta H rxn) for this reaction be
The solubility of which one of the following compounds will increase if the pH of a saturated solution of the compound is lowered
A patient weighs 165 pounds and is to receive a drug at a dosage of 45.0 mg per kg of body weight. The drug is supplied as a solution that contains 25 mg of drug per mL of solution. How many mL of the drug should the patient receive?
The volume if a acid is 10 ml, 10.8 ml of H2SO4 is used to neutralize the acid. What is the titration. 2NaOH + H2SO4 produces NaSO4 + 2H20
that during one such stroke the opposing pressure in the tire was 30.0lb/in2 above the normal atmospheric pressure of 14.7 lb/in2. Calculate the number of joules of work accomplished during each stroke (1 atm= 101.325 J)
A N2 molecule at 20 C is released at sea level to travel upward. Assuming that the temperature is constant and that the molecules do not collide with other molecules, how far would it travel (in meters) before coming to rest
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