Which of the following reactions defines the | vedclass

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(D) The standard enthalpy of combustion,$\Delta H_c^ \circ$,is defined as the enthalpy change when $1 	ext{ mole}$ of a substance is completely burnt

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$H_{2(g)} + \frac{1}{2} O_{2(g)} \rightarrow H_2O_{(l)}$

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(D) The standard enthalpy of combustion,$\Delta H_c^ \circ$,is defined as the enthalpy change when $1 	ext{ mole}$ of a substance is completely burnt in oxygen under standard conditions ($298 	ext{ K}$ and $1 	ext{ bar}$ pressure).Option $A$ represents the formation of water vapor,not the standard state of water.Option $B$ represents the enthalpy of formation of ammonia.Option $C$ represents the combustion of diamond,but the standard state of carbon is graphite.Option $D$ represents the combustion of $1 	ext{ mole}$ of $H_{2(g)}$ to form $1 	ext{ mole}$ of $H_2O_{(l)}$,which is the standard state of water at $298 	ext{ K}$.

Which of the following reactions defines the standard enthalpy of combustion,$\Delta H_c^ \circ$?

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