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10 November, 13:31

Use the table of standard entropy values to determine ΔSºreaction for the following reaction:

2CH3OH (l) + 3O2 (g) → 2CO2 (g) + 4 H2O (g)

A) + 70.627 J/mol*K

B) - 70.627 J/mol*K

C) + 313.766 J/mol*K

D) - 313.766 J/mol*K

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Answers (1)
  1. 10 November, 14:00
    0
    Standar molar entropies from a table:

    CH3OH (l) : 126.8 J / K*mol

    O2 (g) : 205.1 J / K*mol

    CO2 (g) : 213.7 J/K*mol

    H2O (g) : 188.8 J/J*mol

    Now use the coefficients of the reaction and sum the product entropies less the reactant entropies:

    4*188.8 + 2*213.7 - 3*205.1 - 2 * 126.8 = 313.7 J/mol*K

    Answer: option C) + 3173.766 J/mol*K
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