Energy_Balances_Review_PowerPoint_Part_2

Energy_Balances_Review_PowerPoint_Part_2 - Heat Capacities...

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Heat Capacities Heat Capacities Constant Volume: Constant Pressure: For Solids: C p ~ C v For Mixtures: Valid only when Δ H mix can be neglected
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Estimating Heat Capacities Estimating Heat Capacities Table B.2 If the compound is not listed then we must estimate Kopp’s Rule (Table B.10) Use heat capacities of individual atoms to estimate heat capacity of molecule Chueh-Swanson Method Use heat capacities of groups to estimate heat capacity of molecule
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Heat Capacities for Ideal Heat Capacities for Ideal Gases Gases C p = C v + R Monatomic: C v = 3 / 2 R Diatomic: C v = 5 / 2 R Polyatomic (Non-linear): C v = 3R What is the molecular theory behind these? Degrees of freedom Each degree of freedom accounts for 1 / 2 R
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Heat Heat Two kinds of heat Sensible Heat: Change in heat causes a change in temperature Latent Heat: Change in heat causes a phase change
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Latent Heat Latent Heat Why doesn’t the temperature change? All the heat added goes to changing the
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Energy_Balances_Review_PowerPoint_Part_2 - Heat Capacities...

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