Given the Abbreviated Table for Selected Standard State Entropy Values

question 101

Multiple Choice

Given the abbreviated table for selected standard state entropy values of each substance in the reaction below, what is the value of the standard change in entropy, D S ° , for the following chemical reaction?
3 H₂ (g) + Fe₂O₃ (s) →2 Fe (s) + 3 H₂O (g) Substance S ° (Jmol ^{- 1}K ^{- 1}) H₂ (g) 130.6 Fe (s) 27.3 Fe₂O₃ (s) 87.4 H₂O (g) 188.7

• A) D S ° = - 32.5 Jmol ^{- 1}K ^{- 1}
• B) D S ° = - 2.0 Jmol ^{- 1}K ^{- 1}
• C) D S ° = 141.5 Jmol ^{- 1}K ^{- 1}
• D) D S ° = 316.3 Jmol ^{- 1}K ^{- 1}
• E) D S ° = 925.1 Jmol ^{- 1}K ^{- 1}

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