a) A glass of water at 278 K (system) is placed in a microwave oven and the oven is started and at this time begins to boil. Which of q, w, and hangU is positive, negative or is it zero? b) What is wrong with the following statement: Burns caused by steam at 100ºC, May be more severe than burns from water at 100ºC because steam Contains excess heat. Rewrite the sentence to accurately convey the same information. c) 3.00 moles of ideal gas is contained in an adiabatic reciprocating cylinder arrangement. Ti = It has an initial temperature and pressure of 298 K and Pi = 1.00 bar (CV, m = 3/2 R). 20.0 cm The gas is compressed by placing a mass of 625 kg on the piston with a diameter of 625 kg. During this process Calculate the work done and the distance traveled by the piston. The mass of the piston is negligible assume that
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.
a) A glass of water at 278 K (system) is placed in a microwave oven and the oven
is started and at this time begins to boil. Which of q, w, and hangU is positive, negative or
is it zero?
b) What is wrong with the following statement: Burns caused by steam at 100ºC,
May be more severe than burns from water at 100ºC because steam
Contains excess heat. Rewrite the sentence to accurately convey the same information.
c) 3.00 moles of ideal gas is contained in an adiabatic reciprocating cylinder arrangement. Ti =
It has an initial temperature and pressure of 298 K and Pi = 1.00 bar (CV, m = 3/2 R). 20.0 cm
The gas is compressed by placing a mass of 625 kg on the piston with a diameter of 625 kg. During this process
Calculate the work done and the distance traveled by the piston. The mass of the piston is negligible
assume that
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