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Compounds like CCl_2F_2 are known as chlorofluorocarbons, or CFCs. These compounds were once widely used as refrigerants but are now being replaced by compounds that are believed to be less harmful to the environment. The heat of vaporization of CCl_2F_2 is 289 J/g. What mass of this substance must evaporate in order to freeze 150 g of water initially at 25 degrees C? (The heat of fusion of water is 334 J/g; the specific heat of water is 4.18 J/gK)
A particular brand of gasoline has a density of 0.737 g/mL. How many grams of this gasoline would fill a 15.6 gal tank?
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.110 M HClO(aq) with 0.110 M KOH(aq).
How many coulombs of charge are required to cause reduction of 0.20 mole of Cr3+ to Cr? A. 0.60C B. 3.0C C. 2.9×104 C D. 5.8×104 C E. 9.65×104 C an explanation please
if 1.56g of a gas has a volume of 1.00 l at .984 atm and 50 degrees celcius what is the molar mass of the
an evaluation of r was performed following the procedure. the barometric pressure was 736torr the temperature was 295k
How many grams of sodium lactate ( or ) should be added to 1.00 of 0.140 lactic acid ( or ) to form a buffer solution with = 4.10? Assume that no volume change occurs when the sodium lactate is added.
what is the molality of a solution prepared by dissolving 10.0 grams of methylamine ch3nh2 in 50.0 ml of ethanol
Spectroscopic studies have shown that the fusion reaction in the sun's core proceeds by a complicated mechanism. One proposed overall equation for the solar fusion reaction is
initially the temperature is 97.3 degrees celsius. At this temperature the partial pressure of water is 745 mm Hg (torr). What is the % by mass of aniline in the distillate?
What is the pH of the rainwater assuming all the sulfuric acid is in the liquid water droplet? Hint: The "per m3" means per m3 of air for both [H2SO4] and the cloud liquid water.
Calculate the excluded volume for one mole of molecules, which is the constant b. How does this compare with the sum of the volumes of 1 mole of the same molecule
What ions and/or molecules are present in relatively large proportions in a solution of a weak base NH4OH (aq)?
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