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A radiometric dating technique uses the decay of U-238 to Pb-206 (the half-life for this process is 4.5 billion years) to determine the age of the oldest rocks on Earth and by implication the age of Earth itself. The oldest uranium-containing rocks on Earth contain approximately equal numbers of uranium atoms and lead atoms. Assuming the rocks were pure uranium when they were formed, how old are the rocks?
Blending of two wines with different concentrations of acid, Two wines are available for blending: One tank of 1000 L has a Titratable Acidity of 9.0 g/L and another tank containing 2000 L has a Titratable Acidity of 0.6 g/L.
In order to distinguish the R and S forms of a molecule an enzyme must have binding sites for how many of the groups on the stereocenter of the molecule
Calculate the cell potential (emf) for a galvanic cell at 298 K composed of a standard aluminum electrode (Al metal and Al 3+ ions at 1.0 M) and a standard cadmium electrode (Cd metal and Cd 2+ ions at 1.0 M.)
acetic anhydride C4H603 to form aspirin C9H8O4 and acetic acid CH3C00H. What mass of acetic anhydride did the student use? What is the limiting reactant?
If 2 atoms of silver metal react with 1 molecule of fluorine gas at constant pressure, 2 formula units of solid sodium fluoride are produced and 409.2 kJ of heat is released.
The temperature increased by 10.08 oC. Use these data, plus the information given below for CO2 and H2O, to estimate the standard enthalpy of formation, of H, at 25 oC for this compound of H values at 25 oC for CO2(g) and H2O(l) are 394 kJ mol 1 a..
You add 1 mL of 1 M HCl to the buffer. Calculate the molarity of H30+ added as HCl, and the final molarities of acetic acid and acetate ion at equilibrium. What is the new value of pH?
Calculate the change in molar Gibbs free energy of tristearin when a deep-sea creature is brought to the surface (p = 1 atm) from a depth of 1.5 km. The density of sea water is 1.03 g/cm-3.
Draw all stereoisomers of 1,2,3-trimethylcyclopentane. Use bold and hashed wedges to show the stereochemistry.
Nitrogen dioxide (NO2) cannot be obtained in a pure form in the gas phase because it exists as a mixture of NO2 and N2O4. At 25°C and 0.98 atm, the density of this gas mixture is 2.7 g/L.
Determine the pH of an aqueous solution of CaCO3 that contains 1.7*10^-6 M of hydroxide ion [OH^-].
The molar enthalpy of fusion of ice at 0 0C is 6.02 kJ/mol; the molar heat capacity of supercooled water is 75.3 J/molK. (a) One mole of supercooled water at -10 0C is induced to crystallize in a heat-insulated vessel.
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