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For gaseous reactions, if DeltaH is the ...

For gaseous reactions, if `DeltaH` is the change in enthalpy and `DeltaU` that in internal energy, then

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`R=(8epsilon_(o)T)/(sigma^(2))`
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The enthalpy change for chemical reaction is denoted as DeltaH^(Theta) and DeltaH^(Theta) = H_(P)^(Theta) - H_(R)^(Theta) . The relation between enthalpy and internal energy is expressed by equation: DeltaH = DeltaU +DeltanRT where DeltaU = change in internal energy Deltan = change in number of moles, R = gas constant. Enthalpy of the system is given as