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Question

(C) The standard heat of formation $(\Delta H_f^o)$ is defined as the enthalpy change when $1 	ext{ mole}$ of a compound is formed from its constitue

Vedclass · Accepted Answer

$C(	ext{graphite}) + 2H_{2(g)} 	o CH_{4(g)}$

Vedclass · Answer

(C) The standard heat of formation $(\Delta H_f^o)$ is defined as the enthalpy change when $1 	ext{ mole}$ of a compound is formed from its constituent elements in their most stable standard states at $298 	ext{ K}$ and $1 	ext{ bar}$ pressure.For methane $(CH_4)$,the constituent elements are carbon and hydrogen.The most stable state of carbon at standard conditions is graphite,and the most stable state of hydrogen is diatomic gas $(H_2)$.Therefore,the correct equation is: $C(	ext{graphite}) + 2H_{2(g)} 	o CH_{4(g)}$.

Which of the following equations correctly represents the standard heat of formation $(\Delta H_f^o)$ of methane?

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