Which of the following equations correctly represents the standard heat of formation $(\Delta H_f^o)$ of methane?
- A$C(\text{diamond}) + 2H_{2(g)} \rightarrow CH_{4(g)}$
- B$C(\text{graphite}) + 2H_{2(g)} \rightarrow CH_{4(l)}$
- C$C(\text{graphite}) + 2H_{2(g)} \rightarrow CH_{4(g)}$
- D$C(\text{graphite}) + 4H_{(g)} \rightarrow CH_{4(g)}$
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