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4 November, 11:11

Using the thermodynamic information in the ALEKS Data tab, calculate the standard reaction free energy of the following chemical reaction:NOCL---> NO+CLUsing the thermodynamic information in the ALEKS&nRound your answer to zero decimal places

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  1. 4 November, 12:32
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    43.0 kJ

    Explanation:

    The free energy (ΔG) measures the total energy that is presented in a thermodynamic system that is available to produce useful work, especially at thermal machines. In a reaction, the value of the variation of it indicates if the process is spontaneous or nonspontaneous because the free energy intends to decrease, so, if ΔG < 0, the reaction is spontaneous.

    The standard value is measured at 25°C, 298 K, and the value of free energy varies with the temperature. It can be calculated by the standard-free energy of formation (G°f), and will be:

    ΔG = ∑n*G°f products - ∑n*G°f reactants, where n is the coefficient of the substance in the balanced reaction.

    By the balanced reaction given:

    2NOCl (g) - -> 2NO (g) + Cl2 (g)

    At ALEKS Data tab:

    G°f, NOCl (g) = 66.1 kJ/mol

    G°f, NO (g) = 87.6 kJ/mol

    G°f, Cl2 (g) = 0 kJ/mol

    ΔG = 2*87.6 - 2*66.1

    ΔG = 43.0 kJ
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