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Since this measurement is at constant pressure (isobaric), the heat is equal to the change in enthalpy or \(\Delta H\). Note: be careful with the sign on \(\Delta H\). Heat out of the reaction is heat in to the calorimeter and vice versa.ince this measurement is at constant pressure (isobaric), the heat is equal to the change in enthalpy or \(\Delta H\). Note: be careful with the sign on \(\Delta H\). Heat out of the reaction is heat in to the calorimeter and vice versa.
(b) 4.0 atm SO2, 2.0 atm O2, 10 atm SO3. (c) each reactant and product at a partial pressure of 1.0 atm. You need to use the following equation: delta G = delta G o + RT ln Q. where R is the Universal gas constant (8.31 J/molK), T is temp in Kelvin, and Q is the reaction quotient.n additional note for c. When the partial pressures are all equal to 1, Q = 1, and ln 1 = 0. Therefore, delta G = delta G o. This is not suprising because the standard delta G (delta G o)is by definition when the pressures are all equal to 1.