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Get Answers to all your Questions
Q.85) $$
\mathrm{C}(\mathrm{~s})+2 \mathrm{H}_2(\mathrm{~g}) \rightarrow \mathrm{CH}_4(\mathrm{~g}) ; \Delta \mathrm{H}=-74.8 \mathrm{~kJ} \mathrm{~mol}^{-1}
$$
Which of the following diagrams gives an accurate representation of the above reaction? $[\mathrm{R} \rightarrow$ reactants; $\mathrm{P} \rightarrow$ products $]$
A) 
B) 
C) 
D) 
Answers (1)
Q.85) Diagram 2:
- R is higher than P
- $P$ is lower in energy
- The arrow from $P$ to $R$ is labeled 74.8 and points upward
- This is correct because it represents the energy difference, and $\mathbf{\Delta H}=-74.8$ - the arrow shows that products are lower by $74.8 \mathrm{~kJ} / \mathrm{mol}$
- It's common to show the magnitude of $\Delta H$ with an upward arrow between $P$ and $R$ even in exothermic reactions, as long as positions are correct.
Hence, the correct answer is option (2).
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