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A 1.08 g sample of caffeine, C8H10N4O2, burns in a constant-volume calorimeter that has a heat capacity of 7.85 kJ/K. The temperature increases from 298.55 K to 303.37 K. What is the molar heat of combustion of caffeine (in kJ).
write up the chemical reaction between resorcinol and phtalic anhydride.
Consider the following reaction: CO + 2H2= CH3OH, kp= 2.26 x 10^2 at 25C . Calculate delta G for the reaction at 25C under each of the following conditions.
describe the preparation of 400 mL of a solution that is 0.0500 M in I-, starting with MgI2.
If you have 340.0 mL of water at 25.00 °C and add 120.0 mL of water at 95.00 °C, what is the final temperature of the mixture. Use 1.00 g/mL as the density of water.
solution of the monoprotic acid HBr is titrated, and 85.00 mL of 0.59M NaOH is required to reach the equivalence point. What is the original concentration of the acid solution?
pure acetylsalicylic acid in water and titrated solution to equivalence point using 88.43 ml of .102 M NaOH (aq) Assuming that acetylsalicylic acid has only one ionizable hydrogen calculate molar mass of acid
A 2.78 10-4 M solution of a compound has an absorbance of 0.451 at 520 nm in a 1.00 cm cell. The solvent's absorbance under the same conditions is 0.019. What is the molar absorptivity of the unknown compound
A stock solution of lactic acid is 0.04M and a stock solution of lactate is 0.25M. Calculate the pKa of lactic acid given that at these concentrations the pH is 3.90
A 62g piece of ice at 0 degrees C is added to a sample of water at 6 degrees C. All of the ice melts and the temp of water decreases to 0 degrees C. How many grams of water were in the sample?
The solution becomes quite warm, but after it is allowed to return to room temperature, water is added to total 500 mL of solution. Calculate the pH of the final solution. Report pH to 2 decimal places.
In the borohydride reduction of camphor, the two end products were borneol and isoborneol.
Sodium methoxide CH3ONa is a weaker base than BuLi or nBuLi butyllithium. Recommend an explanation why it is not surprising to find that a weaker base is sufficient to prepare the Horner-Emmons-Wittig reagent.
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