Thermodynamics of Chemistry

University:
Duke University
Course:
PHYSICS 161D | Fundamentals of Physics I
Academic year:

2023
Views:

176

Pages:

2
Author:

Pemuda H

Thermodynamics of Chemistry (5.1). SQ=SW+SE = pSV + du neglecting shear stresses and E=U If pressure is constant SQ = 8 (pv) + du = H Q= ha-hi Thermochemical Laws (5.1.2) Lavoisier and Laplace Law - the quantity of heat to decompose a product must be equal to the quantity of heat to form the product Law of Constant Heat Summation (Hess Law) Resultant heat change in a chemical reaction at constant pressure or volume is the same no matter how many stages Write dimensions for everything. Ahf - Enthalpy of Formation (Const. P heat of formation) • enthalpy change when 1 mol forms under standard conditions • value in tables • If negative, it means it's an exothermic process Ahr - Enthalpy of Reaction (Const. Pheat of reaction) • heat transferred (per mole) for a chemical reaction where the products and reactants have same temperature and const. P • Look at example Ahe Enthalpy of Combustion (Const. P heat of combustion) • when chemical reaction is combustion) Higher and Lower Heating Values (HHV and LHV) (5.1.6) HHV- heat transferred when you burn 1 kg of fuel (water liquid) LHV same (water vapor) LHV = HHV-MH her Fuels Defined by Elements (5.2.2) • Look in notes Minimum amount of Oxygen is the amount needed for a stoichiometric reaction min (0) kmol = (+ + 5-0 32 kmol Oz kg fuel min (L) kmol = 4.29 min (0) kmol To make it kg, multiply by molecular mass. Excess air coefficient - = min(L) Stoichiometric amount of L fstoich min(L) fstoich f fstoich If >> 1 lean mixture If><1 rich mixture = equivalence ratio= = Fuels Defined by Chemical Formula (5.2.3) • Look in notes Standard Fuel (5.2.4) LHV min (L) 43,500 = 14.66 kg air/kg fuel kmol air Kg fuel = 0.506 2*3*: mah₂ + mf (hfuel + } comb LHV) = ng

Thermodynamics of Chemistry

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