Boiling point = 78.3 oC Critical temperature = 243 oC Critical pressure = 63.0 atm Density = 0.789 g / mL Triplepoint=150Kat4.3x10-4 Pa q = m C T H = H fusion n H = H vaporization n Draw and label a heating-cooling curve (Temperature vs. Time) for a sample of 500.0 mL of ethanol that is cooled from 75.0 oC to -135.0 oC in a closed container at a constant rate. Then calculate H (in kJ) of the process described above. Is this an endothermic or exothermic change?
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Calculate the total amount of energy change for the following heating-cooling curve.
The following data for ethyl alcohol, also known as ethanol (C2H5OH), may be of some use:
H fusion = 7.61 kJ / mol
H vaporization = 39.3 kJ / mol
Specific heat (C) = 0.97 J / g oC (for solid)
Specific heat (C) = 2.46 J / g oC (for liquid)
Specific heat (C) = 1.70 J / g oC (for vapor)
Melting point = -117.3 oC
Boiling point = 78.3 oC
Critical temperature = 243 oC
Critical pressure = 63.0 atm
Density = 0.789 g / mL
Triplepoint=150Kat4.3x10-4 Pa
q = m C T H = H fusion n H = H vaporization n
Draw and label a heating-cooling curve (Temperature vs. Time) for a sample of
500.0 mL of ethanol that is cooled from 75.0 oC to -135.0 oC in a closed container at a constant rate. Then calculate H (in kJ) of the process described above.
Is this an endothermic or exothermic change?
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