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Physics / An Introduction to Thermal Physics 1 / Chapter 1 / Problem 49P

An Introduction to Thermal Physics | 1st Edition | ISBN: 9780201380279 | Authors: Daniel V. Schroeder

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Consider the combustion of one mole of H2 with 1/2 mole of

Chapter 1, Problem 49P

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QUESTION:

Problem 49P

Consider the combustion of one mole of H2 with 1/2 mole of O2 under standard conditions, as discussed in the text. How much of the heat energy produced comes from a decrease in the internal energy of the system, and how much comes from work done by the collapsing atmosphere? (Treat the volume of the liquid water as negligible.)

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QUESTION:

Problem 49P

Consider the combustion of one mole of H2 with 1/2 mole of O2 under standard conditions, as discussed in the text. How much of the heat energy produced comes from a decrease in the internal energy of the system, and how much comes from work done by the collapsing atmosphere? (Treat the volume of the liquid water as negligible.)

ANSWER:

Step 1 of 3

The change in the enthalpy of the system is given by,

Here, is the internal energy of the system, is the pressure, and is the change in the volume of the system.

The change in the enthalpy of the one mole of water is .

The ideal gas equation is given by,

Here, is the number of moles, is the universal gas constant, and is the temperature of the gases.

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