Ch_5_Thermchemistry

Ch_5_Thermchemistry - STATE FUNCTIONS Independent of path...

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STATE FUNCTIONS Independent of path Examples of state functions: Potential energy (mgh) Temperature (T) Internal energy (E) Enthalpy (H) NOT state functions examples: Distance traveled Work (w) Recall, E = q + w Heat (q)
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H 2 (g) + ½ O 2 (g) H 2 O(l) H = -285.8 kJ ENTHALPY OF REACTION per mole H 2 , per 0.5 moles O 2 , or per mole water produced 2H 2 (g) + O 2 (g) 2H 2 O(l) H = ? -571.6 kJ H 2 O(l) H 2 (g) + ½ O 2 (g) H = ? +285.8 kJ Reger
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HESS’S LAW
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C(s) + ½O 2 (g) CO(g) H = ? C(s) + O 2 (g) CO 2 (g) H = -393.5 kJ CO(g) + ½O 2 (g) CO 2 (g) H = -283.0 kJ C(s) + O 2 (g) CO 2 (g) H = -393.5 kJ CO 2 (g) CO(g) + ½O 2 (g) H = ? ½ +283.0 kJ C(s) + ½O 2 (g) CO(g) H = -110.5 kJ
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Example: calculate the H of reaction for
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PAY ATTENTION TO STATE OF COMPOUND—SOLID, LIQUID, OR GAS
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1 mole of the pure substance 0 , f STANDARD ENTHALPY OF FORMATION H 1 atmosphere pressure 25 ºC or 298.15 K
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Ch_5_Thermchemistry - STATE FUNCTIONS Independent of path...

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