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Unformatted text preview: Chem Exam 4 Review E = ½ k T 1 atm 298 K F2 C2 O2 H2O has a very high specific heat capacity. Potential energy likes to minimize itself. State function- path-independent - H,S,G,E,U,T,V,P Path function – path-dependent- q, w Specific heat capacity is per gram. Isothermal reaction- Delta E = 0 , delta T , w= negative q Internal heat & work Delta E= q + w Delta E = q – bomb calorimeter q = m * delta H q = nc *delta T w = -P*delta V w = -delta n (gas) * RT w = -n * R T ln (V final / V initial) (reversible isothermal) Enthalpy Delta H = Delta E + P delta V If pressure constant, delta H = q – coffee cup calorimeter Delta H f O – 25 degrees C , 1 atm Recognize formation reactions On the right – 1 mole of 1 product On the left – elements in their standard states 3 C graphite (s) + 4 H2 (g) 1 C3H8(s) Delta H formation of propane = based on reaction H, N, O, F , Cl – gases Br – liquid I – solid Enthalpy of formation in a standard state is 0 Gibbs Delta G = Delta H – T delta S Delta S surroundings = - delta H system / T surroundings...
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- Spring '07
- Thermodynamics, Isothermal reaction- Delta