Which of the following is a statement of hess's law?

a) if a reaction carried out in a series of steps the, delta H for the reaction will equal the sum of the enthalpy changes for the individual steps.

b) if a reaction carried out in a series of steps the, delta H for the reaction will equal the product of the enthalpy changes for the individual steps

c) the delta H for a process in the forward direction is equal to the delta H for the process in the reverse direction

d) the delta H for a process in the forward direction is equal in magnitude and opposite in sign to the delta H for a process in the reverse direction

e) the delta H of a reaction depend on the physical state of the reactants and products

Question

Santos Jones

Chemistry

11 August, 10:50

Which of the following is a statement of hess's law?

a) if a reaction carried out in a series of steps the, delta H for the reaction will equal the sum of the enthalpy changes for the individual steps.

b) if a reaction carried out in a series of steps the, delta H for the reaction will equal the product of the enthalpy changes for the individual steps

c) the delta H for a process in the forward direction is equal to the delta H for the process in the reverse direction

d) the delta H for a process in the forward direction is equal in magnitude and opposite in sign to the delta H for a process in the reverse direction

e) the delta H of a reaction depend on the physical state of the reactants and products

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Answers (1)

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Bugsy · Answer 1

Answer: a) if a reaction carried out in a series of steps the, delta H for the reaction will equal the sum of the enthalpy changes for the individual steps.

Explanation:

According to Hess's law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.