230_Sp10_L07_post-1 - CHEM 230 Sp10 Lecture 07 Chapter 6:...

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CHEM 230 Sp10 Lecture 07 Chapter 6: Measure Δ H (q under constant P) 1) q=nC Δ T 2) q in = -q out 3) phase change Session ID: 230
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Under constant P, Δ H = q H is designed for solids and liquids reacting under ~1 atm (constant pressure) Δ H = q q = nC Δ T For gases C v,m + R = C p,m For solids and liquids, C v ~ C P C m molar heat capacity in J/(mol K) q = nC Δ T C s specific heat (capacity) in J/(g K) q = mC Δ T Or o C
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Specific Heat and Molar Heat Capacity Specific heat (J/g o C) C s Molar heat capacity C m (J/mol o C) Water 4.184 75.3 Ethanol 2.43 112.2 Aluminum 0.901 24.3 Lead 0.127 26.4 Diamond 0.509 6.115 Arsenic 0.328 24.6
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Concept Question There are three bars of copper, all with different masses (5g, 10g, and 25g). Heat is applied at the same rate to all three. Which takes the longest to heat up from 25 o C to 100 o C? A. The bar with a mass of 5 g. B. The bar with a mass of 10 g. C. The bar with a mass of 25 g D. All reach 100 o C at the same time.
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Concept Question If you have three bars of copper, all with different masses, (5g, 25g, and 100g), which takes the longest to heat up from 25 o C to 100 o C? A. The bar with a mass of 5g. B. The bar with a mass of 10 g. C.The bar with a mass of 25g D.All reach 100 o C at the same time. Heat capacity is an extensive property: It depends on the amount of matter .
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The specific heats of three substances are listed below. A 5 g sample of each substance that begins at 25
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This note was uploaded on 01/24/2012 for the course PCHEM 230 taught by Professor Gottfried during the Fall '11 term at University of Michigan.

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230_Sp10_L07_post-1 - CHEM 230 Sp10 Lecture 07 Chapter 6:...

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