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Caffeine contains by mass 49.5% C, 5.15% H, 28.9% N and 16.5% O, and the molecular mass is 195g/mol. What are the empirical and molecular formulas of caffeine?
A certain solvent has a normal freezing point of 1.72 ° C, and a freezing point depression constant of 5.07 ° C/m. What is the molality of a solution in
Write balanced ionic equation, net ionic equation, oxidation half reaction and reduction half reaction when liquid sodium chloride is electrolyzed.
At constant pressure, the combustion of C2H6 releases 259 kJ of heat. Find delta H for the rxn: 2 C2H6 (g) + 7O2 (g) -> 4CO2 (g) + 6H20(l)
chloramphenicol is a potent antibiotic isolated from sterptomycesvenezuelae that is particularly effective against
For a Voltaic Cell involving Pb as the anode and Ag as the cathode, what would be the initial voltage of the cell if the initial concentration of Pb2+ was 0.5M and Ag+ was 0.1M
Give two examples for each category of the following Redox reactions. Show molecular equations if the reaction does not occur in aqueous solution, and net ionic equations if the reaction occur in aqueous solution.
Without using equations, explain why Delta S for a liquid or solid is dominated by the temperature dependence of S as both P and T change.
What is the composition in mole fractions of a solution that has a vapor pressure of 33 at 20
Determine the complete formula for hydrated nickel(II) sulfate and its proper name. (show all steps)
A compound of iodine and cesium contains 63.94g of metal and 61.06g of nonmetal. How many grams of cesium are in 38.77g of the compound? How many grams of iodine?
calculate the mass of a sample of copper that occupies 4.2* 10^-3 cm^3 if the density of gold is 8.94 g/cm^3.
A solution is made by mixing 50.0 ml of a HCl (aq) solution which has a pH of 3.00 with 50.0 ml of a KOH solution which has a pH of 12.00.
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