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A solution is made by mixing 46.0 mL of ethanol, C2H6O, and 54.0 mL of water. Assuming ideal behavior, what is the vapor pressure of the solution at 20 °C
Estimate the average area of a cell in square micrometers, and the diameter of a single cell in micrometers, using the data below. Assume the cells are roughly spherical. What is the average cell su
A 23.45g piece of iron and a 29.95g piece of gold at 100.00C were dropped into 530ml of water at 16.05C. The molar heat capacities of iron and gold are 25.19 (j/mol x C) and 25.41 j/(mol x C). respe
Calculate E for each chemical reaction that produces 943 kJ of heat but does no work on its surroundings.
The reusable booster rocket of the U.S. space shuttle employs a mixture of aluminum and ammonium perchlorate for feul. the chemical reaction that occurs is
Calculate E for a system that absorbs 814.0 kJ of heat from its surroundings and does 676.0 KJ of wor on its surroundings.
An expanding gas does 175.0 J of work on its surroundings at a constant pressure of 1.0 atm. If the gas initially occupied 68.0 mL, what is the final volume of the gas
Describe how a distillation works: how can you separate out things with it? which of the functional groups could you easily react via organic reactions to create different compounds
What is the system that is buffered, what is the pH of the system and what compounds are responsible for the buffered system?
A sample of 35 millimole of Krypton gas expands reversibly and isothermally at 373K from 5.25 cubic centimeters to 6.29 cubic centimeters. The internal energy, U, increases by 41.75 J.
Explain how molecular spectroscopy can be used for either the measurement or identification of a molecule.
What is the difference between a "single beam" and a "double beam" instrument. What are some advantages and disadvantages for each of these instrument designs
Explain why the wavelength of light fluoresced by a molecule is longer than the exciting light (absorption) but light fluoresced by an atom is the same wavelength as the exciting light
An IR spectrum for a sample of this solvent is found to show no appreciable absorbance in the region of 1700 cm-1. Of the given possibilities, what is the most likely identity for this paint solvent
This exothermic reaction is catalyzed by MnO2(s). 2H2O2(aq) => 2 H2O(l) + O2(g) Which of the following will increase the rate of this reaction? 1. Raising the temperature 2. Increasing the surfac
Consider the following mechanism: NO => N + O O + O3 => 2 O2 O2 + N => NO2 What is the role of O3
State the selection rule for infrared-active molecules. Also, give an example of a molecule that is IR-active and identify an IR-active bond in the molecule, as well as where one would find its tran
The proposed mechanism for a reaction is 1. ClO-(aq) + H2O(l) => HClO(aq) + OH-(aq) SLOW 2. I-(aq) + HClO(aq) => HIO(aq) + Cl-(aq) FAST 3. OH-(aq) + HIO(aq) => H2O(l) + IO-(aq) FAST Which o
A student has a sample (less than 100 mg) that she would like to test for presence of lead. She has access two different atomic absorption spectrometers (flame and furnace) that could be used for an
For the reaction NO2(g) + CO(g) => NO(g) + CO2(g) at temperatures below 500 K, the rate law is rate = k [NO2]2. Which mechanism is consistent with this information. Mechanism 1 NO2 + NO2 => NO
A first order reaction has a rate constant of 0.210 at 25 oC and 4.91 at 42 oC. Calculate the value of the activation energy in KILOJOULES
A first order reaction has an Arrhenius constant for the reaction is 3.2 x 1010 sec -1, and an activation energy of 65.1 kJ. At what temperature (in Celsius) is the rate constant equal to 0.479 sec-
Starting out on a road trip you inflate your tires on your car to the recommended pressure of 46.5 psi on a day when the temperature is -5.0 C. Upon arrival at your destination, the temperature is n
How would the addition of sodium chloride affect the hydrated cobalt(II) ion equilibrium? Explain using Le Chatelier's principle
The chloride of an unknown metal is believed to have the formula MCl 3. A 1.891g g sample of the compound is found to contain 3.606×10^-2 mol. Find the atomic mass of M.