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Based on mole ratios. A sample is 59.53% C, 5.38%H, 10.68%N, and 24.40%O what is its empirical formula. A 0.2000 gram sample of a compound (vitamin C) composed of only C, H, and O is burned completely with excess O2 . 0.2998 g of CO2 and 0.0819 g of H2O are produced. What is the empirical formula?
Standard reduction potentials for the Pb2+/Pb and Cd2+/Cd haf-reactinos are -.13V and -.40C, respectively. At what relative concentrations of Pb2+ and Cd2+ will these half-reactions have the same reduction potential?
Using what you know about acid/base chemistry, determine the immediate effect that two 325-mg aspirin tablets would have on the pH of the stomach. Assume your stomach is half a liter in volume.
The radius of a uranium atom is 149 pm. How many uranium atoms would have to be laid side by side to span a distance of 4.55 mm?
an ideal gas is contained in a cylinder with a volume of 5.0 102 ml at a temperature of 30degc and a pressure of 720.
Calculate the change in enthalpy for the Mg-HCl reaction using standard enthalpies of formation. Delta Hf for HCl(aq)=-167.2kJ
If cAMP concnetration increases what happens to each of these pathways in the liver? Name the critical enzyme that becomes phosphorylated (not necessarily by PKA) that effects the flux through the pathway
The mass of a cube of iron is 292 g. Iron has a density of 7.87 g/cm3. What is the mass of a cube of lead that has the same dimensions.
The mole fraction of water in the product gas is monitored and found to have the value calculated in part (a) for the first 10hours of operation, but then it begins to increase. What is the most likely cause of the increase? If the process continu..
Describe 3 uses of rhodium as a catalyst (written description and the balanced chemical equation) for its use in 1) three way catalytic converters on cars 2) the manufacture of acetic acid by catalytic carbonylation of methanol, called the Monsanto p..
calculate total heat in (J) needed to convert 0.333 mol of gaseous ethanol at 300 degress celsius and 1 atm to liquid ethanol at 25 degress celsius and 1 atm
Write an equation, using the curved-arrow notation, for the acid-base reaction that will take place when each of the following are mixed. If no appreciable acid-base reaction takes place
The Carbohydrate content of a glycoprotein is determined to be 12.6, 11.9, 13.0, 12.7, 12.5 g of carbohydrate per 100 g protein in replicate analysis.
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