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A 200,000-amu average molecular weight polymer is contaminated with .5% of a 100-amu impurity, most probably the monomer. Find out the error in the molecular weight determination if a .0001 molar aqueous solution is used. Presume a temperature of 25.0C.
a what is the concentration of baoh2 in abaoh2 solution if the ph is 8.25?b what is the concentration of ammonium ion
The decomposition of hydrogen peroxide is first order in H2O2. 2H2O2 -----> 2H2O + O2 The rate constant for this reaction at 20 C is 1.8 * 10^-5 s^-1
The pH of the solution when exactly 13mL of base has been added was 3.82. You notice that the concentration of the unknown acid was 1.0M. What are the Ka and the pKa of your unknown acid
Predict the order of elution of a mixture of triphenylmethanol, biphenyl, benzoic acid, and methyl benzoate from an alumina column.This has to do with column chromatography and explain your reasoning.
A mixture of gases conssists of CH4 at a partial pressure of 143 mm Hg, N2 at a partial pressure of 469 mm Hg, and O2 at a partial pressure of 563 mm Hg
Germanium forms a substitutional solid solution with silicon. Compute the weight percent of germanium that must be added to silicon to yield an alloy that contains 4.43 × 1021 Ge atoms per cubic centimeter
A 1.4639g sample of limestone was analyzed for Fe, Ca, and Mg. The iron was determined as Fe2O3, yielding 0.0357g. Calcium was isolated as CaSO4, yielding a precipitate of 1.4058g, and Mg was isolated as 0.0672g of Mg2P2O7.
Assuming that an enzyme uses a mechanism similar to that of chymotrypsin, determine which residue of the catalytic triad (Asp, His, Ser) corresponds to pKa of 6.25 and 8.75.
If Beryllium oxide crystallizes in the zinc blend structure. (a) Approximate the density of this compound. (b) What is the % ion character. (c) Explain what is anticipated coordination number for the material. Is this reliable with the actual stru..
Consider the following chemical equation. SO2(g) + O2(g) ? SO3(g) If 1.30 L of sulfur dioxide gas reactions with 3.25 L of oxygen gas, what is the volume of sulfur trioxide produced. Assume all gases are at the same temperature and pressure.
0.700L of formic acid-formate buffer with a pH of 3.74. How many milliliters of the two stock solutions of 1.25M HCOOH and 1.0M NaOH would you combine to make the 0.700L of buffer.
The flask was removed, was quickly cooled to condense the volatile liquid, dried and weighed. The mass of the flask and the volatile liquid is 34.743 grams
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