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1. Millions of tons of coal are burned every year to produce electricity for humanity. The coal that is burned is a form of pure carbon. (Diamonds and graphite are other forms of pure carbon). A sample of coal is completely burned in a 10.0 L cylinder at a constant pressure of 1.10 atm and a temperature of 1000 oC.
The combustion reaction produces 2.3x104 J of heat energy. As the gaseous products expand they push against a piston which increases the cylinder volume to 55.0 L. After combustion the gases are allowed to reach equilibrium. A chemical analysis shows that there are 15.7 moles of O2 and 9.8 moles of CO2 in the cylinder at equilibrium. A second combustion experiment is carried out at a temperature of 1455 oC. Using the information above calculate the equilibrium constant you would expect to measure for the experiment carried out at the higher temperature.
2. Gasoline currently powers the majority of automobiles in the U.S. but electric cars have been touted as a way to reduce our dependence on gasoline as well as improve our air quality by reducing production of byproducts associated with gasoline combustion. Right now gas costs approximately $4.00 per gallon and electricity costs approximately $0.0818 per kilowatt-hour (kWh). (1 watt (W) = 1 J/s and 1 watt-hour (Wh) = 3600 J). Assume that gasoline is comprised of pure octane (C8H18) and is combusted with pure O2 at constant pressure. How much would you spend on electricity to obtain the same amount of energy as you would get by burning one gallon of gas?
How many moles of O2 would be required to react with 0.850 moles of CS2 in CS2(l) + O2(g) CO2(g) + SO2(g)?
Determine the Osmotic Pressure for the following aqueous solutions @ 25 degrees Celsius. (a.) 1.0. M Glucose, and (b.)1.0 M NaCl. Explain which solution has the greater osmotic pressure if any and why.
describe the change in conductivity as the concentration of the NaCl solution was increased by the addition of NaCl drops
Use the solution pH to calculate the concentration of hydronium ion present
Suppose that all 175 L of liquid nitrogen in a tank accidentally vaporized in lab that measured 10.00 m X 10.00 m X 2.50 m. What maximum fraction of the air in the room is displaced by the gaseous nitrogen?
What is the hybridization scheme for the central atom in the following?
how many grams of benzene are needed in 46.3 grams NaBr (103 g/ mol)? the freezing point of solution to 3.94 degree C?
How much heat is required to warm 227 g of ice from -44.9°C to 0.0°C, melt the ice, warm the water from 0.0°C to 100.0°C, boil the water, and heat the steam to 173.0°C?
Indicate how many electrons are transferred in the formation of one formula unit of product
Metals such as magnesium and zinc react with dilute sulfuric acid to give hydrogen, according to the equation: M (s) + H2SO4 (aq) -------> MSO4 (aq) + H2 (g) When 5.00 g of a mixture of powdered magnesium and zinc were dissolved in diluted sulfuri..
The Ka of a monoprotic weak acid is 5.16 × 10-3. What is the percent ionization of a 0.153 M solution of this acid?
Write and balance the equation for the complete combustion of ethane, C2H6. You do not need to include any phase symbols
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