A particular compound has a boiling point of 82.3 oC when the vapor pressure is 1.00 atm. Its heat of vaporization is 35.1 kJ/mol. Determine the vapor pressure of the compound (in units of atm) when the temperature is changed to 69.7 oC.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
I got a test with this question and I got it wrong, I would like to know which is the right asnwer and process for this. Thank you.
A particular compound has a boiling point of 82.3 oC when the vapor pressure is 1.00 atm. Its heat of vaporization is 35.1 kJ/mol. Determine the vapor pressure of the compound (in units of atm) when the temperature is changed to 69.7 oC.
Recall that:
ln(P2/P1) = (\DeltaΔHvap /R) \times× [(1/T1) -− (1/T2)]
R = 0.0820573 L \cdot⋅ atm / (K \cdot⋅ mol)
R = 8.31446 J / (K \cdot⋅ mol)
Write the relation between vapor pressure of any liquid at two different temperature.
Where and are the initial and final vapor pressure.
and are the initial and final temperature at Kelvin scale.
is the enthalpy of vaporization.
is the universal gas constant.
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