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A chemist has 80.0 kg of a mixture that is 10.0% potassium nitrate by mass. How much additional potassium nitrate must be added to produce a final mixture that has a potassium nitrate content of 25.0%?
A pentapeptide was found to contain the amino acids Phe, Gly, Met, Ala, and Ser. N-Terminal analysis yielded the PTH derivative of alanine. Partial hydrolysis of the pentapeptide yielded the dipeptides
What is the pH for a buffer solution containing 0.49 molar acetic acid and 0.02 molar potassium acetate
Explain why the bond dissociation energy for the C-C sigma bond in propane is lower than the BDE for the C-C bond in propene.
Write the two chemical equations that show the titration reactions of the carboxylic acid group and the amino group of glyclyglycine
A buffer is to be prepared by adding solid sodium acetate to 0.10 M CH3COOH. Which of the following concentrations of sodium acetate will produce the most effective buffer
What is the volume of 1.31 kg of mercury at 25 C? You can use any reliable reference to look up the density of mercury.
A 1.013-g sample of ZnSO4xH2O is dissolved in an aqueous solution of BaCl2. The pure BaSO4 precipitate is filtered out of solution, dried, and its mass is determined to be 0.9400 g. What is the value of x in ZnSO4xH2O?
Silver chloride, often used in silver plating, contains 75.27% Ag. Calculate the mass of silver chloride required to plate 225 mg of pure silver.
isotope 1 has a mass of 120.9038 rm amu and a relative abundance of 57.4 and isotope 2 has a mass of 122.9041 rm amu.
Calculate the vapor pressure lowering of a solution of 2.40 g of aspirin (molecular weight = 180.15 g/mol) in 55.0 g of methanol (CH3OH) at 21.2°C
Large quantity of ammonia are burned in the presence of platinum catalyst to give nitric oxide as d first step in the preparation of nitric acid.
Write contributing (important) resonance structures for each of the following compounds and predict their relative C=O vibrational frequencies based on the importance of the contributing resonance structures. List in them order from highest to low..
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