A sample of argon gas at 1.00 atm and 200. K has a volume of 40. 0 L. What is the volume if the temperature is increased to 400. K and the pressure becomes 2.00 atm? Explain your answer based on the changes to the pressure and the temperature.
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 sample of argon gas at 1.00 atm and 200. K has a volume of 40. 0 L. What is the volume if the temperature is increased to 400. K and the pressure becomes 2.00 atm? Explain your answer based on the changes to the pressure and the temperature.
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This Problems is from Unit 1 – Activity 8 It is # 22
(Stoichiometry problems involving gases collected over water:
- 40.0 mL of a 3.79 M solution of H2O2 decomposes according to this reaction:
2 H2O2 (aq) à 2 H2O(l) + O2 (g)
The oxygen formed is collected over water in an inverted graduated cylinder at 20.0 oC. The volume of gas in the cylinder is 1.94 L. What is the total pressure in the cylinder when reaction is complete? Note: the vapor pressure of water is 17.55 mm Hg at 20.0oC.
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