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In a semi-conductor, the molecular orbital states that allow for the conduction of electric current are
a) the lowest energy states available
b) the higher energy states available
c) independent of energy and only depend on the number of p-orbital electrons in the element
d) are the energy states just below the band gap
undergo combustion according to the unbalanced equation C2H6+O2=CO2+H2O how many moles of oxygen are required?
The value of Kc for this reaction is 5.0 at 600 K. What are the equillibrum partial pressures of the three gases if a reaction vassel initially contains a mixture of the reactants in which Pco=Pcl2=0.215 atm and Pcocl2= 0.000 atm?
The combustion of .1703 mole of hydrocarbon produces 12.27g H2O and 22.48g CO2. What is the molar mass of the hydrocarbon?
Propanol freezes at -89.5 degrees C and boils at 82.3 degrees C. What quantity of heat is needed to convert 10.0 g of solid 2-propanol at -89.5 degrees C to a vapor at 82.3 degrees C?
A peanut is burned in a calorimeter made from an aluminum can. The peanut weighed 0.780 g before combustin and .054 g after combustion. The temperature change of aluminum can filled with 200 ml of water was 15.3. (Density of water = 1.00g/C)
The difference between voltages measured when 71.1 mL and 22.1 mL of AgNO3 have been added is 0.3929 V. Using this voltage difference and your answers to questions (a), (b), and (c), calculate the numerical value of the quotient Ksp,AgCl/Ksp,AgI.
Determine what would you use to prepare 10 ml of 0.2M CaCl 2 from the 20M stock solution and find out which solution is with pH > 7, but is not an Arrhenius base in the strict sense?
A mixture of CO, CO2 and O2 is contained within a 275 mL ?ask at 0?C. If the total pressure is 780 torr, the CO has a partial pressure of 330 torr and the CO2 has a partial pressure of 330 torr.
A solution is prepared by mixing 75.0 mL of 5.00 M HCl and 20.0 mL of 8.00 M HNO3. Water is then added until the final volume is 1.00 L. Calculate [H+], [OH -], and the pH for this solution.
How many grams of NaCl must be added to 250g water to lower the vapor pressure by 1.30 mm Hg at 40 degrees C assuming complete dissociation?
Calculate the molar concentration of CO2 for a sample that has a pH of 6.220 and a HCO -3 concentration of 0.0020 M. For carbonic acid pKa1=6.33 and pKa2=10.35.
What is the volume of a unit cell of this metal? 4.What is the edge length of a unit cell of Fe?
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