Determine the Change in the Standard Entropy of the Universe $\frac { 1 } { 2 }$

question 13

Multiple Choice

Determine the change in the standard entropy of the universe for the reaction
H₂(g) + $\frac { 1 } { 2 }$ O₂(g) $\rightarrow$ H₂O(g)
Given $\begin{array}{lll} Substance&&S^{\circ}(\mathbf{J} /(\mathbf{m o l} \cdot \mathbf{K}) ) \\& \Delta H_{\mathbf{f}}^{\circ} & \\ & (\mathbf{k J} / \mathbf{m o l}) & \\ \mathrm{H}_{2}(g) & & 130.6 \\ \mathrm{O}_{2}(g) & & 205.0 \\ \mathrm{H}_{2} \mathrm{O}(g) & -241.8 & 188.7\end{array}$

• A) -767 J/K
• B) +197.4 J/K
• C) -197.4 J/K
• D) +767 J/K
• E) +665 J/K

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Definitions:

Granum

A stack of thylakoids within the chloroplasts of plant cells, crucial for the light reactions of photosynthesis.

Porphyrin Ring

A large, heterocyclic macrocycle composed of four modified pyrrole subunits interconnected via methine bridges, essential in the structure of heme groups and chlorophyll.

Magnesium

A chemical element with the symbol Mg, essential for living cells, playing a critical role in over 300 enzymatic reactions, including energy production.

Manganese

A chemical element with the symbol Mn and atomic number 25, known for its importance in metabolism and enzyme function in living organisms.