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Caffeine is made up of 49.5% C, 5.2% H, 16.5% O, and 28.9% N. A solution made up of 8.25 g of caffeine and 100.0 mL of benzene (d=0.877 g/mL) freezes at 3.03 C. Pure benzene (Kf=5.10 C/m) freezes at 5.50 C. What are the simplest and molecular formulas for caffeine?
Draw the skeletal structure for major organic product produced when the arene given reacts with 2 equivalents each of Na and HOCH3
The density of a 50% solution of NaOH is 1.525 g/mL. What volume of a solution that is 50% by weight NaOH is required to make 1 Liter of 0.15M NaOH solution.
A buffer is prepared by adding 9.00 g of ammonium chloride (NH4Cl) to 260 mL of 1.00 M NH3 solution. Write the complete ionic equation for the reaction that occurs when a few drops of nitric acid are added to the buffer.
carbon monoxide and oxygen react to produce carbon dioxide. if 75.3 l of carbon monoxide and 38.0 l of oxygen are used
calculate the average kinetic energies of the ch4 and n2 molecules at 286 k and 556
what is the mass of iron in grams in the sample? a. 0.000904 g b. 0.0559 g c. 0.904 g d. 1.105 g e. 55.85 g
Determination of Solubility Product of a Metal Hydroxide lab report .. what was the results and conclusion
How many grams of hydrogen chloride can be produced from 350 grams of sodium chloride and 290 grams of hyroden sulfate if the reaction has a yield of 88%?
How many liters of water vapor can be produced if 13.3 liters of methane gas (CH4) are combusted, if all measurements are taken at the same temperature and pressure?
Plot pH values as a function of volumes of added KOH and suggest appropriate indicators for the titration.
A solution is prepared by mixing 75.0 mL of 0.030 M BaCl2 and 250. mL of 0.040 M K2SO4. What are the concentrations of barium and sulfate ions in this solution? Assume only SO42- ions (no HSO4-) are present.
aliquot of 0.0529 m H2SO4 (aq) is to be titrated with 0.0411 m NaOH (aq). What Volume (mL) of base will it take to reach the equivalence point?
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