PROBLEMS (1 L atm = 101.325 J, 1 L bar = 100.000 J)1. In an exothermic process, the volume of a system contracted from 3243 mL to 2087 mL against a constantpressure of 1.063 bar. During the process, 124.6 calories of heat energy were released. What was the internalenergy change for the system in joules?2. Calculate the change in internal energy for the thermal decomposition of 5.432 g of potassium chlorate at aconstant external pressure of 1.634 bar. The decomposition reaction is2KC1(s) + 3 O2(g)Potassium chlorate's heat of formation is -391.20 kJ/mol, potassium chloride's heat of formation is -435.87kJ/mol, and oxygen has a density of 1.308 g/L at the reaction temperature. Recall that the enthalpy of a reactioncan be determined by a summation of enthalpies of formation.2 KC103 (5)AΜΠΟΣ

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1. In an exothermic process, the volume of a system contracted from 3243 mL to 2087 mL against a constant pressure of 1.063 bar. During the process, 124.6 calories of heat energy were released. What was the internal energy change for the system in joules?

1. In an exothermic process, the volume of a system contracted from 3243 mL to 2087 mL against a constant pressure of 1.063 bar. During the process, 124.6 calories of heat energy were released. What was the internal energy change for the system in joules?

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

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.

Question

PROBLEMS (1 L atm = 101.325 J, 1 L bar = 100.000 J)
1. In an exothermic process, the volume of a system contracted from 3243 mL to 2087 mL against a constant
pressure of 1.063 bar. During the process, 124.6 calories of heat energy were released. What was the internal
energy change for the system in joules?
2. Calculate the change in internal energy for the thermal decomposition of 5.432 g of potassium chlorate at a
constant external pressure of 1.634 bar. The decomposition reaction is
2KC1(s) + 3 O2(g)
Potassium chlorate's heat of formation is -391.20 kJ/mol, potassium chloride's heat of formation is -435.87
kJ/mol, and oxygen has a density of 1.308 g/L at the reaction temperature. Recall that the enthalpy of a reaction
can be determined by a summation of enthalpies of formation.
2 KC103 (5)
A
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