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  • The enthalpy change for a reaction does not depend upon theOption: 1 Physical state of reactants and products.<div class='qna

The enthalpy change for a reaction does not depend upon the

Option: 1

Physical state of reactants and products.


Option: 2

Use of different reactants for the same products.


Option: 3

Nature of intermediate reaction steps.


Option: 4

Difference in initial or final temperature of involved substances.


Answers (1)

best_answer

Hess's Law -

The total amount of heat change in a chemical reaction is the same whether the reaction is carried out in one or several steps by one or more methods.

C_{(s)}+O_{2(g)}\rightarrow CO_{2(g)}

\Delta H_1=110.5kJ

CO_{(g)}+\frac{1}{2}O_{2(g)}\rightarrow CO_{2(g)}

\Delta H_2=283.0kJ

\Delta H=\Delta H_1+\Delta H_2

Hess's law of constant heat summation states that regardless of the multiple stages or intermediate steps of the reaction the total enthalpy change for the reaction is the sum of all changes.

The enthalpy of a chemical process is independent of the path taken from the initial and the final state.

Therefore, option(3) correct.

 

Posted by

Anam Khan

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