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Quantitative Analytical Chemistry
1. To convert between natural logarithm (ln) to base 10 logarithm, times by 2.303. So what is the expected slope in the Nernst equation (n=1) if your temperature was 15.17 and not 25.00 degrees celsius?
2. What is the electromotive efficiency, ß, if your temperature is 36.85 degrees Celsius and your slope is 0.05916 (n=1) in the Nernst equation?
3. When Dr. Harris was a boy, Uncle Wilbur let me watch as he analyzed the iron content of runoff from his banana ranch. A 5.00 mL sample was acidified with nitric acid and treated with excess KSCN to form a red complex. (KSCN is colorless). The solution was then diluted to 25.00 mL and put in a variable pathlength cell. For comparison, a 10.0 mL reference sample of 7.62 x 10-4 M Fe3+ was treated with HNO3 and KSCN and diluted to 25.00 mL. This reference sample was placed in a 1.00 cm light path. The runoff sample exhibited the same absorbance as the reference when the path length of the runoff cell was 4.08 cm. What was the concentration of iron in ppm Fe (not M) in Uncle Wilbur's runoff?
What is the heat of reaction for 1 kg of the mixture calculated using heat of combustion data for a fuel comprised of 10% ethanol and the rest octane? How much is the heat of reaction reduced by adding the 10% ethanol to the octane
A 2.63 L flask is filled with carbon monoxide at 27°c until the pressure is 6.72 ATM. Compute the total pressure after 2.89moles of carbon dioxide has been added to the flask.
At a fixed temperature, equal moles of N2 (g) and F2 (g) are mixed in a constant pressure container (the volume of the container changes in order to keep the pressure at a constant value). The N2 (g) and F2 (g) are allowed to react, producing NF3 ..
Two liquids, and , have vapor pressures at a given temperature of 24 and 36 , respectively. We prepare solutions of and at a given temperature and measure the total pressures above the solutions. We obtain the following data
C5H5N, and 0.350 moles/l in pyridinium chloride, C5H5NHCl you are given a kb value of 1.7 x 10^-4 for pyridine find the ph of this solution using this kb value
Calculate the amount of solution that contains 8.0g calcium cloride (CaCl2) from 35% solution of CaCl2?
A chemical engineer studying the properties of fuels placed 1.500 g of a hydrocarbon in the bomb of a calorimeter and filled it with O2 gas. The bomb was immersed in 2.500 L of water and the reaction initiated.
Question- Calculate the volume of 0.20M of acetic acid, .020M sodium acetate and pure water needed to make 20.00mL of a buffer having pH=5.00. Repeat analogous, separate calculations for buffers having pH=4.00 and pH=6.00.
List all substrates and enzymes involved in the Electron Transport Chain. What is the route followed by electrons from glucose to O2
A student places 220.1 grams of CO2 gas into a balloon at 302 K and 1.03 atm. What is the volume of the balloon
Explain what is the cell potential at 25 if the concentrations are 0.364, 0.342, and 0.895 and the pressure of is 8.90
Predict whether the reaction below is product-favored or reactant-favored by calculating delta Gdegree from the entropy and enthalpy changes for the reaction at 25 degrees C, H2(g) + CO2(g) yeilds H2O(g) + CO(g), delta H rxn = 41.17kJ S = 42.08J/K
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