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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?
If 45.4g of H2O are produced in the reaction given below, the number of grams of magnesium carbonate used is.?
What volume of pure oxygen gas (O2) measured at 546 K and 1.00 atm is formed by complete dissociation of 0.7 mol of Ag2O? 2 Ag2O(s) → 4 Ag(s) + O2(g)
The Ksp for Al(OH)3 is 2 x 10-32. At what pH will a 0.2 M Al3+ solution begin to show precipitation of Al(OH)3.
A gas mixture composed of helium and argon has a density of 0.719g/l at a 743mmHg and 298k . What is composition of mixture by volume?
Draw the Lewis structure for C1F 2 + (small s at bottom and small + at top) What are its electron-pair and molecular geometries? decribe the bonding in the molecule in terms of hybrid orbitals.
1.What is the effect of the following on the observed melting point of the compound: a) insoluble purity, such as charcoal; b) incomplete drying of the sample; c) less recrystallization solvent was used than it was needed?
calculate the vapor pressure of the pressure cooker if the temperature inside the pressure cooker is 119 degree celcuis.
Which one of the following molecules has a zero dipole moment? A. CO B. CH2Cl2 D. SO2 C. SO3 E. NH3 67. Indicate the type of hybrid orbitals used by the central atom in CCl4. A. sp B. sp2 C. sp3 D. sp3d E. sp3d2 68. What is the hybridization of th..
a solution is made by mixing 20.0 mL 0.4 M NaCH3COO with 30.0 mL 0.4 M CH3COOH, calculate the pH? For acetic acid, Ka = 1.76 x 10-5.
Determine the V of a voltaic cell (E°cell) if it is required to do 5.43 × 10¯3 Kilo Joule of work when a charge of 2.50 C is transmitted.
consider a stone column 3.00 ft in diameter and 10.00 ft high. What is is mass in pounds if its density is 3.50 g/mL.
Using pH-based arguments only, why do scientists use phosphate-based bufers instead of buffers made using acetic acid
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