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A 16.96 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 16.58 grams of CO2 and 3.394 grams of H2O are produced. In a separate experiment, the molar mass is found to be 90.04 g/mol. Determine the empirical formula and the molecular formula of the organic compound.
calculate the volume, in liters, of each of the following solutions that provides the given amount of solute: a)5.00 mol of NaOH from a 12.0 M solution. b)15.0 g of Na2SO4 from a 4.00 M solution. c)28.0 g of NaHCO3 from a 1.50 M solution.
10.9g of ice at 0.00 degrees C is mixed with 50.0g of water at 32.0 degrees C. What is the final temperature of the mixture? (heat of fusion=333J/g; specific heats: ice=2.09J/gK; water=4.184J/gK
In combustion studies of the use of H2 as an alternative fuel, HO is sometimes formed in flames by the reaction
Calculate the percent by mass of calcium carbonate in the rock, assuming that it is the only substance reacting with the HCl solution.
In a gas mixture, the partial pressures are nitrogen 420 torr , oxygen 125 torr , and helium 245 torr. What is the total pressure (torr) exerted by the gas mixture?
Unfold the enzyme with urea and 2-mercaptoethanol. Then incubate and crystallize it in the presence of the substrate followed by X-ray crystallography.
What is the rate of consumption of O2 in a combustion reaction carried out in a 11.00 L flask if 6.30 mmol of oxygen is consumed in 25.6 s?
The solubility of silver carbonate is 33.5 mg/L. What is it molar solubility and what is its Ksp?
The osmotic pressure of a aqueous solution of a given polymer with mass concentration 0.300 g/mL is 10.0 torr at 298 K. Estimate the molar mass of the polymer.
Eventually, the amounts of the three species do not change further; the system has reached equilibrium. (at this point, approximately 22% of the HI has decomposed.) Describe what is happening in this system at the molecular level.
What mass of NaOH (s) must be added to 1.0 L of 0.050 M NH3 to ensure that the percent ionization of NH3 is no greater than 0.0010%? Assume no volume change on addition of NaOH. Kb NH3=1.8 x10^-5
n-type semiconductors can be formed by addition of the elemental metals to the parent compound. For example, addition of Zr to ZrO or Ti to TiO. Like wise, p-type semiconductors
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