Which of the following reactions can be used | vedclass

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(A) The standard enthalpy of formation $(\Delta_fH^{\circ})$ is defined as the enthalpy change when $1 	ext{ mole}$ of a substance is formed from its

Vedclass · Accepted Answer

$C(	ext{graphite}) + O_{2_{(g)}} ightarrow CO_{2_{(g)}}$

Vedclass · Answer

(A) The standard enthalpy of formation $(\Delta_fH^{\circ})$ is defined as the enthalpy change when $1 	ext{ mole}$ of a substance is formed from its constituent elements in their most stable standard states.
For $CO_{2_{(g)}}$,the constituent elements are carbon (in its stable form,graphite) and oxygen (as $O_{2_{(g)}}$).
The reaction $C(	ext{graphite}) + O_{2_{(g)}} ightarrow CO_{2_{(g)}}$ represents the formation of $1 	ext{ mole}$ of $CO_{2_{(g)}}$ from its elements in their standard states.
Therefore,option $A$ is correct.

Bond	Bond Enthalpy $(kJ \ mol^{-1})$	Enthalpy of formation $(kJ \ mol^{-1})$
$C-H$	$400$	$C(g): 700$
$C-C$	$350$	$H(g): 200$
$C=O$	$700$	$O(g): 250$

Which of the following reactions can be used to define the standard enthalpy of formation of $CO_{2_{(g)}}$?

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