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Fermentation of starch and sugar crops yields about 10% molar volumes of ethanol in water. Distillation of this mixture to remove the water and produce pure ethanol is an expensive and energy intensive process. To reduce fuel costs, some researchers have proposed partial distillation to a 50% mixture of ethanol and water, a mixture that could be used to power a high temperature fuel cell. Calculate the enthalpy change in oxidizing this mixture in air if the reactants are at 298 K and the products are at 1200 K.
How many grams of LiCl are needed to make a saturate solution with 300 grams of H2O if the molality of the solution is 19.7.
An unidentified organic compound X, containing C,H, and O was subjected to combustion analysis. When 228.4 mg of pure X was burned 627.4 mg of CO2 and 171.2 mg of H2O were obtained.
A concentration of 0.5 ppm by volume SO2 in air is harmful to plant life. What is the percent by volume of this concentration
A sample of iron has a mass of 257.0 lb and a volume of 0.523 ft3. What is its specific gravity? and What are the units of specific gravity?
what is the enthalpy change per mole of ethanol combusted? The specific heat capacity of water is 4.184 J/g×K and the molar mass of ethanol is 46.07 g/mol.
For a particular reaction, deltaH is -93.8kJ and deltaS is -156.1 J/K. Assuming these values change very little with temperature, over what temperature range is the reaction spontaneous in the forward direction?
What is the total pressure in torr of a gas in a sealed flask that contains oxygen at a partial pres. of 0.41atm and water vapor at a partial pres. of 358mmHg?
Oleum or fuming sulfuric acid availble commerically in concentrations ranging from 20 to 99% sulfur trioxide. 1. What is the percentage by mass of sulfer trioxide (SO3)
A compound contains atoms of three elements X, Y and Z.The oxidation numbers are X +2, Y +5 & Z -2.formula ? How can we formulate formula of a ternary compound using their valency?
How many milliliters of boiling water are required to dissolve 25g of phthalic acid? If the solution were cooled to 14oC, how many grams of phthalic acid would you recrystallize out?
Amides undergo hydrolysis to carboxylic acids on treatment with alkali. Diagram a suitable mechanism for the conversion of benzamide to benzoic acid
What mass of CCl2F2 substance must evaporate in order to freeze 109 of water initially at 24 degrees celsius? (The heat of fusion of water is 334 J/g the specific heat of water is 4.18 J/gK .)
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