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A mixture of methane and water vapor pressure is passed over a nickel catalyst at 1000K. The emerging gas is collected in a 5.00L flask and is found to contain 8.62g of carbon monoxide, 2.60g of hyd
A compound contains only C, H, and O. To analyze the compound, you determine its empirical formula by analysis for C and H, and its molar mass by freezing point depression.
You take 3.1789 g of a substance and place it into 100.0 g of benzene. The boiling point of this solution is found to be 80.5464 EC. What is the approximate molar mass of the substance?
Dinitrogen pentoxide decomposes in chloroform as a solvent to yield nitrogen dioxide and oxygen gas. The decomposition is first order with a rate constant of 1.0 x 10-5 s-1 at 45 degrees Celsius.
A liter of a solution saturate at 25 degree c with calcium oxalate, CaC2O4 is evaporated to dryness giving a .0061 gm residue of cac2o4. Calculate the concentration of the ions and the molar solubil
The Kp value was calculated as 8.491 g. What does the Kp value tell you about the solubility of benzoic in the two solvents dichloromethane and water?
Any point between the energy of the reactants and the point of highest potential energy in the course of the reaction
The structure of the compound K2O is best described as a cubic closest packed array of oxide ions with the potassium ions in tetrahedral holes. What percent of the tetrahedral holes are occupied in
Potassium chromate (K2CrO4) is manufactured in a process in which 1.25 kg/s of a solution that is 33.3wt% K2CrO4 in the fresh feed stream is mixed with a recycle stream containing 36.36% K2CrO4, and
90% of the methane stream fed to the reactor is consumed and 85.5% of the methane fed to the reactor is converted to the desired formaldehyde product. Calculate the molar composition of the reactor
As part of the process of producing sugar crystals from sugar cane, raw sugar cane juice is sent to a series of evaporators to remove water. The sugar cane juice, which is 85wt% water, is fed to the
Consider a 1 liter rigid vessel that is initially half full of water and half full of air at room temperature and 5 atmospheres of pressure.
Explain why most multicellular organisms use an iron-containing protein for oxygen binding rather than free iron. Your answer should include an explanation of (a) the role of heme and (b) the role
What are amino-acid tRNA synthetase enzymes and why are they important in the biology of cells? How many different ones do you know exist in any given cell type?
When a 0.6333-g sample of a compound of carbon, hydrogen and sulfur was burned in excess oxygen, 0.9272 g CO2, 0.3795 g H2O and 0.6749 g SO2 were obtained.
The specific heat capacity of silver is 0.235 J/g K. Its melting point is 962 C and its enthalpy of fusion is 11.3 kJ/mol. What quantity of heat in joules is required to change 5.00 g of silver fro
An organic substance has an enthalpy of vaporization of 29.0 kJ/mol. The compound has a vapor pressure of 524 mm Hg at 25 °C. At what temperature is the vapor pressure equal to 115 mm Hg?
If your air conditioner is more than several years old, it may use the chloroflurocarbon CCl2F2 as the heat transfer fluid. The normal boiling point of CCl2F2 is -29.8 C and the enthalpy of vaporiza
The heat of formation of KCl(s) is -436.7 kJ/mol and the heat of formation of KCl(aq, 1 m) is -419.5 kJ/mol. Determine the heat of solution of KCl.
The vapor pressure of pure water at 50.0 °C is 92.5 mm Hg. Calculate the ideal partial pressure of water at this temperature for a mixture of 45.0 g H2O and 55.0 g CH3OH?
Aerosol cans carry clear warnings against incineration because of the high pressures that can develop upon heating. Suppose that a can contains a residual amount of gas at a pressure of 765 mmHg and
How many hydrogen bonds exist per full turn of the alpha helix? What is the rise in angstrom? Can these be different in different alpha helices? Explain.
The geometric angle BETWEEN the two bonds that connect an alpha-carbon to its nearest neighbors on the polypeptide backbone is approximately 109 degrees. Explain. What is polypeptide backbone?
A chemical reaction is found to have an activation energy (Ea = 15 kJ/mol). At a temperature of 505 K, what fraction of collisions have enough energy to exceed the activation energy?