Alcohols for Use as Biofuels Can Be Produced from Glucose $\longrightarrow$

question 23

Multiple Choice

Alcohols for use as biofuels can be produced from glucose that is obtained from starch and cellulose in plants. Use the information in the table below to determine the free-energy change and whether or not this reaction is spontaneous at 78°C, which is the boiling point of an ethanol-water azeotrope.
C₆H₁₂O₆(s) $\longrightarrow$ 2CH₃CH₂OH(l) + 2CO₂(g) $$\begin{array} { | c | c | c | } \hline \text { Compound } & & \boldsymbol { S } ^ { \circ } \\& \Delta \boldsymbol { H } _ { \mathbf { f } } ^ { \circ } & { [ \mathbf { J } / ( \mathbf { m o l } \cdot \mathbf { K } ) ] } \\\hline \text { Glucose } ( s ) & ( \mathbf { k J } / \mathbf { m o l } ) & 212 \\\hline \text { Ethanol } ( l ) & - 1,274 & 161 \\\hline \text { Carbon dioxide } ( g ) & - 278 & 214 \\\hline\end{array}$$

• A) -6 kJ, spontaneous
• B) +76 kJ, not spontaneous
• C) -76 kJ, spontaneous
• D) -258 kJ, not spontaneous
• E) -258 kJ, spontaneous

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