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Using p-aminobenzoic acid, give equations showing how procaine and procaine monohydrochloride could be prepared. which of the two possible amino functional groups in procaine will be protonated first?
The volume of sea water displaced by the plastic block is 2.37 cm3. Assuming the density of the sea water is 1.025 g/mL, what is the density of the plastic?
Two types of electrochemical cells which are based on thermodynamic principles can be described. Which of the following statements about these cells is correct
A certain reaction has an activation energy of 70.0 Kj/mol and a frequency factor of A1 = 4.80×1012. A) What is the rate constant, k , of this reaction at 30.0 C
Find t what temperature is it necessary to have twice as many atoms in the ground state as in the excited state at 16.4 1/cm of c atoms The degeneracy of the ground state is 1 and the first state degeneracy is 3
Which of the following has a dipole moment. A) CO2 B) BCl3 C) BrF3 D) more than one of these E) none of these
Describe how you would purify p-nitrobenzoic acid from a mixture of a 9.0 g of p-nitrobenzoic acid and 2.0 g of o-nitrobenzoic acid using recrystallization. Tell which solvents you would use and how the components would get separated.
the heat calculated after a calimetry experiment is equal to the enthalpy change for reaction. Use the thermochemical data to calculate the enthalpy chanfe for the reaction of NaOH and CH3COOH.
It was later determined that each molecule of the unknown base could accept two protons. What is the molar mass of this unknown compound?
buffer that has a pH of 9.80 and an osmotic pressure of 1.04atm at 298 K. What masses of HCN and NaCN should you use to prepare the buffer? mHCN, mNaCN =
A set of data gave an average unpopped kernel of 0.12 grams. How many kernels are in a pound of unpopped corn?
What is the volume in mL of 0.466 M HCl(aq) needed to reach halfway to the equivalence (stoichiometric) point in the titration of 49.6 mL of 0.789 M trimethylamine (Kb = 6.5 x 10-5).
Carbon dioxide has an enthalpy of sublimation of 25.2 kJ/mol at -78 OC. If 0.975 kg of dry ice is placed into a bowl open to the atmosphere (i.e., constant pressure), what is the entropy of sublimation at this temperature
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