Answers CCSD Chemistry CP IC 25-26 Unit Test — Unit testQuestion 11

11

QuizMultiple Choice

Unit Test — Unit test

Question 11 • CCSD Chemistry CP IC 25-26

According to Hess’s law, if a series of intermediate reactions are combined, the enthalpy change of the overall reaction is

Answer

A

the difference between the enthalpies of the intermediate reactions.

B

the sum of the enthalpy changes of the intermediate reactions.

C

the product of the enthalpy changes of the intermediate reactions.

D

the fraction of the individual enthalpies of the intermediate reactions.

Explanation

Hess’s law states that the enthalpy change depends only on the initial and final states, not on the path taken. Therefore, when intermediate reactions are added to produce the overall reaction, their enthalpy changes are added too; the overall change is the sum of the intermediate enthalpy changes.

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