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When a 8.37-g mixture of methane, CH4, and ethane, C2H6, is burned in oxygen at constant pressure, 445.8 kJ of heat is liberated. What is the percentage by mass of CH4 in the mixture? The standard enthalpies of combustion for CH4 and C2H6 are -890.3 kJ mol-1 and -1569.7 kJ mol-1, respectively.
Why do primary alkyl halides typically undergo Sn2 substitution reactions more rapidly than do secondary or teritary alkyl halides?
What is the molar mass of a gas which occupies 32.9 L at 82oC under 1.124 atm of pressure and has a mass of 23.7 grams
Calculate the volume (in mL) of He collected at STP when 3.60 g of pure 226Ra is stored in a closed container for 135 years.
AIDS drugs such as Indavir and Amprenavir act by 1. inhibiting an enzyme that catalyzes the cleavage of a peptide bond between the gag and pol fragments in the gag-pol protein.2 2.catalyzing the cleavage of a peptide bond between the gag and pol ..
describe how will you prepare a supersaturated solution of potassium nitrate in water.
Calculate the number-average molecular weight of a random nitrile rubber [poly(acrylonitrile-butadiene) copolymer] in which the fraction of butadiene repeat units is 0.30; assume that this concentration corresponds to a degree of polymerization of..
The relative electrophoretic mobilities of a 30-kd protein and a 92-kd protein used as standars on an SDS polyacrylamide gel are 0.80 and 0.41, respectively.
What carbonyl compound would the following condensation product? Which of the following could result from a self-aldol condensation followed by dehydration?
Define internal energy and enthalpy. What is the difference between the two? List the following gases in order of increasing root-mean-square speed, all at the same temperature: H2, He, O2, Ne
A 129-mL portion of that solution is diluted by adding 121 mL of water. What is the final concentration? Assume the volumes are additive.
How many grams of sodium lactate should be added to 1.00 L of 0.150 lactic acid ( or ) to form a buffer solution with = 4.10? Assume that no volume change occurs when the sodium lactate is added.
How many grams of lanthanum chloride LaCl3 must be added to 1 kg of water to lower the freezing point of water by 1.1 degrees C?
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