Part A: Methane at low temperatures Methane (CH4) is a tetrahedral molecule. Determine its specific heat capacity (at constant volume) at very low temperatures. Enter the value in units of the universal gas constant R. Hint: Remember that both vibrational and rotational modes are "frozen out" at low temperatures. What does the motion of a polyatomic gas molecule look like if it cannot vibrate or rotate? Cv,low = ? Part B: Methane at moderate temperatures Determine the specific heat capacity (at constant volume) of methane at moderate temperatures.
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.
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