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Determine the concentrations (in M) of acetic acid and sodium acetate in 0.2 M 'acetate' buffer, pH 6.0. The pKa for acetic acid is 4.76.
Caffeine (C8H10N4O2) is a stimulant found in coffee and tea. If a solution of caffeine in chloroform (CHCl3) as a solvent has a concentration of 0.0870 m, calculate the following. (a) the percent caffeine by mass (b) the mole fraction of caffeine
12.0 moles of gas are in a 6.00 tank at 20.3. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane are a=2.300 L^2*atm/mol^2 and b=0.0430 L/mol .
Trimethylamine (CH3)3N is a substance responsible in part for the smell of fish. it has a boiling point of 3.5 degrees c and a molecular weight of 59.1.
The half-life of U-235, an alpha emitter, is 7.1*10^8 yr.Calculate the number of alpha particles emitted by 9.1 mg of this nuclide in 8.0 minutes.
assuming the unknown acid has one acidic proton per molecule, what is the molecular formula of the unknown acid?
Find ratio of the atomic mass of Silicon to Hydrogen if every 100g of SiH4 contains 87.45g of Si and 12.55g of H.
The major monochrominated product which results when ethylcyclohexene is subjected to free rdical bromination is one of the following. chose your answer from the list provided.
What mass of silver is needed to absorb 50.0 cal of heat if the tempature of the sample rises from 24 c to 36.4 c Specific heat of silver
Glucose Isomers, When glucose is placed in water two stereoisomers are formed, one with the new OH on the opposite side of the ring than the 6th carbon
Assume in state A, V=4.00dm&3, p=1.00atm, t=300K, Va=10Vb, Pc/Pb=5 and Cp,m= 7/2R. Determine the change in entropy of the system and the surroundings for each step of the cycle.
nknown gas effuses in 11.0 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.56 min. What is the molar mass of the unknown gas
Elements are always arranged in order of increasing atomic weights. Metallic properties increase going from bottom to top in a family of elements.
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