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

question 10

Multiple Choice

Alcohols for use as biofuels can be produced from glucose that is obtained from starch and cellulose in plants. For example, 1 mol of glucose can produce 2 mol of ethanol. Use the information in the table below to determine the maximum amount of work and energy that can be produced by the combustion of glucose compared with that by the combustion of 2 mol of ethanol.
C₆H₁₂O₆(s) $\longrightarrow$ 2CH₃CH₂OH(l) + 2CO₂(g) $$\begin{array} { | c | c | } \hline \text { Compound } & \\& \Delta G _ { \mathrm { f } } ^ { \circ } \\& ( \mathbf { k J } / \mathbf { m o l } ) \\\hline \text { Glucose } ( s ) & - 910 \\\hline \text { Ethanol } ( l ) & - 175 \\\hline \text { Water } ( g ) & - 229 \\\hline \text { Carbon dioxide } ( g ) & - 394 \\\hline\end{array}$$

• A) 1 mol glucose = 2,830 kJ, 2 mol ethanol = 2,600 kJ
• B) 1 mol glucose = 2,830 kJ, 2 mol ethanol = 1,300 kJ
• C) 1 mol glucose = 2,190 kJ, 2 mol ethanol = 2,780 kJ
• D) 1 mol glucose = 1,420 kJ, 2 mol ethanol = 1,390 kJ
• E) 1 mol glucose = 2,190 kJ, 2 mol ethanol = 1,300 kJ

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Definitions:

Hydrolysis

A chemical reaction in which water breaks down another compound, splitting it into two or more substances.

3-Heptanone

An organic compound that is a ketone with seven carbon atoms, where the carbonyl group is located at the third carbon.

Propanal

An aldehyde with the chemical formula C3H6O, characterized by a three-carbon chain with a terminal carbonyl group.

Chromic Acid

An oxidizing agent made by dissolving chromium trioxide in water or by dissolving dichromate salts in sulfuric acid, used primarily in cleaning laboratory glassware and in certain oxidation reactions.