Lecture_34_PPT

Lecture_34_PPT - Chapter 19-22 Thermodynamics Idea Gas...

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Chapter 19-22 Thermodynamics Idea Gas
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Specific Heat Q T m z If energy Q transfers to a sample of a substance of mass m and the temperature changes by T , then the specific heat is Q c mT
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Values of Molar Specific Heats of Gases
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Molar Specific Heat of Ideal Monatomic Gas z A monatomic gas contains one atom per molecule z When energy is added to a monatomic gas in a container with a fixed volume, all of the energy goes into increasing the translational kinetic energy of the gas z E int = 3/2 n R T
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Ideal Monatomic Gas z E int = 3/2 n R T z At constant volume, W=0, E int = Q + W = Q = n C V T z Solving for C V C V = 3/2 R , R = 8.31 J/mol . K C v = 12.5 J/mol . K
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Values of Molar Specific Heats of Gases
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Molar Specific Heat of Ideal Monatomic Gas z We define specific heats for two processes that frequently occur: Changes with constant volume = 0 z E int = Q + W = Q Changes with constant pressure z E int = Q + W = Q - P V C V C p
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Monatomic Gas z In a constant-pressure process : Changes with constant pressure z E int = Q + W = Q - P V C p z P V = n R T z E int = 3/2 n R T z Q = C p n T z W = n R T z E int = Q + W
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This note was uploaded on 01/28/2011 for the course PHYS 011 taught by Professor Nianlin during the Fall '08 term at HKUST.

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Lecture_34_PPT - Chapter 19-22 Thermodynamics Idea Gas...

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