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Compute the pH of a buffer solution obtained by dissolving 28.0g of KH2PO4(s) and 38.0g of Na2HPO4(s) in water and then diluting to 1.00 L.
1calculate the total pressure in atm of a mixture of 0.0270 mol of helium he and 0.0200 mol of oxygen o2 in a 4-l flask
determine whether or not it is chiral and specify the absoute configuration of any chiral carbons
a) how many moles of sulfur are in 23.2 g of (C3H5)2S, b) how many atoms of hydrogen are in 0.75 mol of (C3H5)2S, c) how many grams of carbon are in 4.20 x 10^23 molecules of (C3H5)2S, d) how many atoms of carbon are in 15.0 g of (C3H5)2S
Glutamine, glycine, aspartic acid, threonine, isoleucine and arginine form a hexapeptide. how many charged groups would this peptide have at pH 13. what are they
Calculate (a) the mole fraction of the solute, (b) the number of moles of solute in the solution, and (c) the molecular mass of the solute.
The combustion of 0.1584 grams of benzoic acid increases the temperature of a bomb calorimeter by 2.45 (degrees) C. Calculate the heat capacity of this calorimeter.
If something goes wrong, all of the cyanide could end up in the air of the lab, calculate the minimum size of the lab to keep the concentration of hydrogen cyanide in the lab below 5% of the lethal dose.
Show the long hand and short hand electron configuration and orbital diagram for elements with these atomic numbers:
calculate the molarity of acetic acid in a viegar sample knowing that 5.00 ml of vinegar requires 43.50 ml of 0.105 m
The leaves of a Rhubarb contain high concentrations of diprotic oxalic acid (HOOCCOOH) and must be removed before the stems are used to make rhubarb pie. If pKa1=1.23 and pKa2=4.19, what is the pH of a .0282 M solution of oxalic acid
what are the first two ionization energies of calcium and zinc? based on the values which metal would you expect to be
How do you know when an element that is by itself has an oxidation number of zero or its charge
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