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How much energy in J is needed to convert 48 g of liquid ethanol at 67 oC to vapor at 97oC. You might need to know that: mp = -114 oC and bp = 78oC The heat of fusion is 4.6 kJ/mol and the heat of vaporization is 46.0 kJ/mol. Finally, the specific heats of the solid, liquid and gas are, respectively 2.1, 3.2 and 1.8 J/g oC.
How many grams of CO2 are produced by the complete combustion of 2.00g of C8H18?
would a given amount of flourine react with different masses of the two hydrogen isotopes? Does this violate the law of definite proportions.
When 24 copper pennies are submerged in water, the pennies displace 8.26 cm3 of water. If the combined mass of the pennies is 73.86 g, what is the density of copper?
Which of the following is a mechanism by which enzymes assist in formation of a transition state intermediate? a) Preventing interference by water molecules.
The next three (3) problems deal with the titration of 461 mL of 0.501 M carbonic acid (H2CO3) (Ka1 = 4.3 x 10-7, Ka2 = 5.6 x 10-11) with 1.1 M NaOH. What is the pH of the solution at the 2nd equivalence point
A helium balloon at a high altitude has 2.1 × 104 L of helium at 0.40 atm and -13°C. If the balloon descends to an altitude in which the atmospheric pressure is 1.00 atm and the temperature is 20°C.
consider the titration of 25 mL of .25 M NH3 with .05M HBr .What is the pH at the equivalence point?
A cube of a gold with a volume of 59 cm3 has a mass of 980 g. The density of pure gold is 19.3 g/cm3. What is the percent error of the measured density?
The element lanthanum has an atomic weight of 139 and consists of two stable isotopes lanthanum-138 and lanthanum-139.
A sample of gas occupies a volume of 115mL at a pressure of 720. mmHg. Calculate its volume at STP.
What is the expected theoretical yeild of aspirin based on exactly 1 g of salicylic acid and 3.50 mL of Acetic Anhydride (Density = 1.082 mL^-1)
the density of plutonium metal is 19.84 g/cm3 , and the density of plutonium (IV) oxide is 11.46 g/cm3. over a period of 7-10 years, a 2.5-kg sample of plutonium metal stored at Los Alamos National Laboratory in New Mexico was converted to plutoni..
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