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Freon-12 is used as a refrigerant in central home air conditioners. The rate of effusion of Freon-12 to Freon-11 (molar mass=137.4g/mol) is 1.07:1. The formula of Freon-12 is one of following: CF4 , CF3Cl , CF2Cl2 , CFCl3 , OR CCl4 . Which formula is correct for Freon -12?
What is the enthalpy of combustion of this fuel in kJ/mol? The specific heat capacity of water is 4.184 J/g-°C.
Which of the following would be expected to have the lowest freezing temperature?
Calculate the molar solubility of barium sulfate a) in water, and b), in a solution containing 0.60 M of sodium sulfate.
Addition of NH3 precipitated Fe2O3*xH2O, which was ignited to give 0.264g of Fe2O3 (FM 159.69). What is the average mass of Fe2SO4*7H2O (FM 278.01) in each tablet?
An avergae 70-kg adult human contains 170g of potassium. 0.0118% of naturally occuring potassium is potassium-40, which is a beta emitter with a half life of 1.28x109 years. What is the total activity (in counts per minute) of a human being, due s..
What is the half-life? b) How long would it take for the concentration of CH3CN to decrease to 25% of its initial value? c) To 12.5% of its initial value?
Draw a complete electronic mechanism of the aldol product between benzaldehyde and acetophenone.
What effect would each of the following erros have on the determined concentration of the unknown acid? (would the calculated value be too high, too low, or unchanged?) explain
Calculate the solubility of Ce(IO3)3 (pKsp=10.86) in: a) distilled H20 b) 0.300 M Ce(NO3)3 solutiom c) 0.200 M KIO3 solution
Calculate the potential that would be measured if the solution pH were 9.70, assuming the selectivity coefficient (Ks) for OH- is 0.1 and that ß is 1.00.
N2O4+ 2 N2H4= 3 N2 + 4 H2O, Determine the limiting reactant and the mass in grams of nitrogen that can be formed from 50.0g N2O4 and 45.0g N2H4. The molar masses are as follows: N2O4=92.02g/mol, N2H4=32.05g/mol.
What volume of pure oxygen gas measured at 740 torr and 27 degree C will be obtained when 15.0 g of potassium chlorate are decomposed
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