Ethanol specific heat capacity

A sample of ethanol, C2H5OH, absorbs 23.4 kj of energy. The temperature of the sample increases from 5.6°C to 19.8°C. What is the mass of the ethanol sample The specific heat capacity of ethanol is 2.46 J/g °C. 

A 1.000-gram sample of ethanol, C2H5OH, was burned in a bomb calorimeter whose heat capacity had been determined to be 2.71 kJ/°C. The temperature of 3000 grams of water rose from 24.284°C to 26.225°C. Determine A for the reaction in joules per gram of ethanol, and then in kilojoules per mole of ethanol. The specific heat of water is 4.184J/g-°C. The combustion reaction is... 

The amount of heat given off by the system (in the sealed compartment) raises the temperature of the calorimeter and its water. The amount of heat absorbed by the water can be calculated using the specific heat of water similarly, we use the heat capacity of the calorimeter to find the amount of heat absorbed by the calorimeter. The sum of these two amounts of heat is the total amount of heat released by the combustion of 1.000 gram of ethanol. We must then scale that result to correspond to one mole of ethanol. 

Practice Problem B A 25.95-g sample of methanol at 35.6°C is added to a 38.65-g sample of ethanol at 24.7°C in a constant-pressure calorimeter. If the final temperature of the combined liquids is 28.5°C and the heat capacity of the calorimeter is 19.3 J/°C, determine the specific heat of methanol. 

The reduction of available solvent by addition of precipitant is, in principle, no different than the crystallization of sea salt from tidal pools as the heat of the sun slowly drives the evaporation of water. It is a form of dehydration but without physical removal of water. A similar effect may be achieved by the slow addition to the mother liquor of certain organic solvents such as ethanol or methyl pentanediol. The only essential requirement for the precipitant is that at the specific temperature and pH of the experiment, the additive does not adversely affect the structure and integrity of the protein. This is often a very stringent requirement and deserves more than a little consideration. Organic solvent competes, to some extent, like salt for water molecules, but it also reduces the dielectric screening capacity of the intervening solvent. Reduction of the bulk dielectric increases the effective strength of the electrostatic forces that allow one protein molecule to be attracted to another. 

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