What is enthalpy of a reaction?.

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Q. The enthalpy of a reaction at

273 K

. is -

3.57 K J

. What will be the enthalpy of reaction at

373 K

Δ C_{p} = z e r o

Q. For a reaction:

C_{(s)} + O_{2 (g)} \to C O_{2 (g)}

what is the relation between enthalpy of reaction (

Δ H_{r}

), enthalpy of formation of

C O_{2} (Δ H_{f}

) and enthalpy of combustion of carbon (

Δ H_{c o m b}

Q. For an exothermic reaction, what is the value of

Δ H

or enthalpy?

Enthalpy is an extensive property. In general, if enthalpy of an overall reaction A $\to$ B along one route is $Δ_{r} H$ and $Δ_{r} H a n d Δ_{r} H_{1}, Δ_{r} H_{2}, Δ_{r} H_{3} \dots$ represent enthalpies of intermediate reactions leading to product B. What will be the relation between $Δ_{r} H$ overall reaction and $Δ_{r} H_{1}, Δ_{r} H_{2} \dots$ etc for intermediate reactions.

Q. Carbon and oxygen react together to form carbondioxide. What is the value of enthalpy of reaction in above reaction.

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