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Copper can be drawn into thin wires. How many meters of 34-gauge wire (diameter = 6.304 x 10^-3 in.) can be produced from the copper in 6.95 lb of covellite, an ore of copper is 66.0% copper by mass? (Hint: Treat the wire as a cylinder: V for cylinder = (pi)(r^2)(h); d of copper = 8.95 g/cm^3)
Scientists are working on purifying PFK-1C from rabbit brain tissue. The rabbit brain tissue was homogenized and centrifuged to remove insoluble material. Next, the soluble preparation was loaded on top of an ATP-Sepharose column.
A balloon has a volume of 1.75L at a temperature of 25°C. What will be the volume of the balloon if you take it out into the winter cold air at -15°C?
What mass of chromium could be deposited by electrolysis of an aqueous solution of Cr2(SO4)3 for 155 min using a constant current of 15.0 A? (F = 96485 C/mol)
The concentration of Pb2+ in a commercially available standard solution is 1.000 mg/mL. What volume of this solution should be diluted to 6.0 x 10^2 mL to produce a solution in which the concentation of Pb2+ is 0.0505 mg/L? in Homework Help
A covalent compound is composed of a nitrogen atom, a hydrogen atom, and a carbon atom. How many electrons should the Lewis structure of the covalent compound contain
according to the given reaction c2h5oh3o2 reacts with 2co23h2o a 35.6g sample of ethanol c2h5oh is burned a bomb
What mass of NaOH is needed to precipate the Cd upper case 2 upper case + ions from 30.0mL of 0.520 M italic Cd (NO3)2 solution
Fermentation of glucose produces ethyl alcohol and carbon dioxide; C6H12O6(l) ? 2 C2H5OH(l) + 2 CO2(g) What is ?H°rxn (in kilojoules) if 385.3 mL of CO2 was collected over water at 20.00°C and 761.2 mm Hg
In a first order decomposition in which the rate constant is 0.201 sec-1, how long will it take (in seconds) until 0.131 mol/L of the compound is left, if there was 0.566 mol/L at the start
A system conducts 238 cal of heat to the surroundings while delivering 331 cal of work. what is the change in internal energy of the system (in cal).
In the decomposition of hydrogen peroxide, the percentage yield of oxygen is 93%. What is the actual yield in grams of oxygen if you start with 100 grams of H2O2.
Helium gas at constant pressure of 7.4 atm, expands in volume from 21.3 L to 79.2 L. The temperature is held at 278 K. Calculate the work done by the gas (in joules).
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