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Xanthine is a biological precursor of uric acid. What can you say about the molar absorptivity of xanthine if absorbance measurements of 250 ?M, 300 ?M, and 350 ?M buffered aqueous solutions in 1 cm path-length cuvette gave absorbance values of 2.43, 2.51, and 2.66, respectively
basketball with a volume of 3.50 liters is left in a car when the temperature is 298 k. what will the volume of the
What is the total pressure in a 10.0 L container that contains 0.56 g of SF6, 2.3 g of NO, and 1.23 X 10^23 g of Co molecules at 300K
The rate constant for the reaction 2HI(g) -> H2(g) + I2(g) doubles on raising the temperature from 683K to 698K. What is the activation energy fro this reaction in kJ/mol
the catalyst reacts with the reactants. B. A catalyst initiates a chemical reaction. C. A catalyst lowers the activation energy of the reacting molecules
The temperature at which a substance melts or boils depends upon the strengths of the intermolecular forces. What must happen for a substance to melt in terms of particles, intermolecular forces, and energy
A pound of coffee beans yields 50 cups of coffee (4 cups = 1 qt). How many milliliters of coffee can be obtained from 8 g of coffee beans?
For the following reactants, predict the products formed (if any) and write the balanced molecular equation, complete ionic equation and net ionic equation. Ca(s)+ HCI(aq)
Calculate the mass of ferrous ammonium sulfate you would need to add to a 100.00 mL volumetric flask to make a solution that is 59 ppm in Fe. Then, stock solution A is prepared by dissolving 183.5 mg of ferrous ammonium sulfate in water and diluti..
a 5.00L air sample at a temperature of -50 degrees celsius has a pressure of 107 kpa. what will be the new pressure if the temperature is raised to 102 degrees celsius and the volume expands to 7.00L.
In the reaction Cd+CuSO4?CdSO4+Cu, what is the reduction half reaction. What is the reducing agent. Explain your answer.
The following data were collected for the rate of disappearance of NO in the reaction 2NO(g) + O2(g) ---------> 2NO2(g). Experiment [NO] (M) [O2] (M) Initial Rate (M/s)
If a chemistry student collected 834 mL of gas at 25 degrees C and 8.00 x 10^2 torr, how many moles did she collect?
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