enthalpy

Enthalpy is an energy-like property or state function-it has the dimensions of energy (and is thus measured in units of joules or ergs), and its value is determined entirely by the temperature, pressure, and composition of the system and not by its history.

The enthalpy change for the following reaction is -137 kJ. Using bond energies, estimate the C-C bond energy in C2H6(g). I need a correct answer please thank you. and if you can, properly explain how.

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Calculate online thermodynamic and transport properties of water and steam, based on industrial (IAPWS-IF97) or scientific (IAPWS-95) formulation. Mollier diagrams included. Calculate properties of combustion gases.

left/ {\vphantom {{\rm{J}} {{\rm{gmol}}^\circ {\rm{C}}}}} \right. } {{\rm{gmol}}^\circ {\rm{C}}}} {/eq}. The expression for the change in enthalpy of the sulphurdi-oxide gas is, {eq}\Delta H =.

Enthalpies of formation are set H values that represent the enthalpy changes from reactions used to create given chemicals. If you know the enthalpies of formation required to create products and reactants in an equation, you can add them up to estimate the enthalpy much as you would with bond energies as described above.

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The enthalpy can be made into an intensive, or specific, variable by dividing by the mass. propulsion engineers use the specific enthalpy in engine analysis more than the enthalpy itself. How does one use this new variable called enthalpy? Let’s consider the first law of thermodynamics for a gas.

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Enter a mass or volume in one of the boxes below. Upon hitting submit, the stoichiometric equivalents will be calculated for the remaining reactants and products.

Example 5. Write the thermochemical equation for the reaction of PCl 3 (g) with Cl 2 (g) to make PCl 5 (g), which has an enthalpy change of 88 kJ.. Solution. The thermochemical equation is. PCl 3 (g) + Cl 2 (g) PCl 5 (g) H = 88 kJ. Test Yourself. Write the thermochemical equation for the reaction of N 2 (g) with O 2 (g) to make 2NO(g), which has an enthalpy change of 181 kJ.

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