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24 February, 05:58

Select whether there is no work done by the system, work done by the system or work done by the surroundings for each system described below: A. H2O (l) / longrightarrow⟶ H2O (g) ΔH = 44.0 kJ/mol B. 2 NO (g) + O2 (g) / longrightarrow⟶ 2 NO2 (g) ΔH = - 114.1 kJ/mol C. Cl (g) + O3 (g) / longrightarrow⟶ ClO (g) + O2 (g) ΔH = - 163 kJ/mol D. CaCO3 (s) / longrightarrow⟶ CaO (s) + CO2 (g) ΔH = 110.1 kJ/mol E. 4 NH3 (g) + 5 O2 (g) / longrightarrow⟶ 4 NO (g) + 6 H2O (l) ΔH = - 906 kJ/mol

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  1. 24 February, 07:52
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    A) work done by the system;

    B) work is negligible;

    C) work is negligible;

    D) work done by the system;

    E) work doe by the surroundigs.

    Explanation:

    The work is the energy that a gas gain or loses to expand or compress, respectivately. So, if the gas molecules increase, the work is done by the system, if they decrease, the work is done by the surroundigs, if they don't change, or if there is no gas in the reaction, the work is negligible.
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