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According to Hess’s Law if a reaction takes place in several steps then its standard reaction enthalpy is
- a)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 35∘C
- b)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature
- c)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 2 bar
- d)the difference of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature
Correct answer is option 'B'. Can you explain this answer?
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According to Hess’s Law if a reaction takes place in several ste...
Hess’s Law states that the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature.
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According to Hess’s Law if a reaction takes place in several ste...
According to Hess's Law, the standard reaction enthalpy of a reaction is the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature. Let's break down the explanation into headings and bullet points for clarity:
Explanation:
1. Hess's Law: Hess's Law states that the enthalpy change for a chemical reaction is the same regardless of whether the reaction occurs in one step or in several steps.
2. Overall reaction: The overall reaction refers to the chemical reaction that we are interested in. It can be represented by a balanced chemical equation and has a corresponding standard reaction enthalpy.
3. Intermediate reactions: When a reaction occurs in several steps, we can break down the overall reaction into a series of intermediate reactions. These intermediate reactions are smaller steps that lead to the formation of the final products.
4. Standard enthalpies: Each intermediate reaction has its own standard enthalpy, which is the heat change associated with the reaction occurring under standard conditions (1 bar pressure and a specific temperature, usually 298 K or 25 °C).
5. Sum of standard enthalpies: According to Hess's Law, the standard reaction enthalpy of the overall reaction is the sum of the standard enthalpies of the intermediate reactions. This means that we can calculate the overall reaction enthalpy by adding up the enthalpies of the individual steps.
6. Same temperature: It is important to note that when calculating the standard reaction enthalpy, the intermediate reactions should be divided at the same temperature. This ensures that the enthalpies are consistent and can be added together.
7. Option B: Therefore, the correct answer is option B, which states that the standard reaction enthalpy is the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature.
In conclusion, Hess's Law allows us to determine the standard reaction enthalpy of a reaction that occurs in several steps by summing up the standard enthalpies of the intermediate reactions. This is done at the same temperature to ensure consistency in the calculations.
Explanation:
1. Hess's Law: Hess's Law states that the enthalpy change for a chemical reaction is the same regardless of whether the reaction occurs in one step or in several steps.
2. Overall reaction: The overall reaction refers to the chemical reaction that we are interested in. It can be represented by a balanced chemical equation and has a corresponding standard reaction enthalpy.
3. Intermediate reactions: When a reaction occurs in several steps, we can break down the overall reaction into a series of intermediate reactions. These intermediate reactions are smaller steps that lead to the formation of the final products.
4. Standard enthalpies: Each intermediate reaction has its own standard enthalpy, which is the heat change associated with the reaction occurring under standard conditions (1 bar pressure and a specific temperature, usually 298 K or 25 °C).
5. Sum of standard enthalpies: According to Hess's Law, the standard reaction enthalpy of the overall reaction is the sum of the standard enthalpies of the intermediate reactions. This means that we can calculate the overall reaction enthalpy by adding up the enthalpies of the individual steps.
6. Same temperature: It is important to note that when calculating the standard reaction enthalpy, the intermediate reactions should be divided at the same temperature. This ensures that the enthalpies are consistent and can be added together.
7. Option B: Therefore, the correct answer is option B, which states that the standard reaction enthalpy is the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperature.
In conclusion, Hess's Law allows us to determine the standard reaction enthalpy of a reaction that occurs in several steps by summing up the standard enthalpies of the intermediate reactions. This is done at the same temperature to ensure consistency in the calculations.
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According to Hess’s Law if a reaction takes place in several steps then its standard reaction enthalpy isa)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 35∘Cb)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperaturec)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 2 bard)the difference of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperatureCorrect answer is option 'B'. Can you explain this answer?
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According to Hess’s Law if a reaction takes place in several steps then its standard reaction enthalpy isa)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 35∘Cb)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperaturec)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 2 bard)the difference of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperatureCorrect answer is option 'B'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about According to Hess’s Law if a reaction takes place in several steps then its standard reaction enthalpy isa)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 35∘Cb)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperaturec)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 2 bard)the difference of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperatureCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for According to Hess’s Law if a reaction takes place in several steps then its standard reaction enthalpy isa)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 35∘Cb)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperaturec)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 2 bard)the difference of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperatureCorrect answer is option 'B'. Can you explain this answer?.
According to Hess’s Law if a reaction takes place in several steps then its standard reaction enthalpy isa)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 35∘Cb)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperaturec)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 2 bard)the difference of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperatureCorrect answer is option 'B'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about According to Hess’s Law if a reaction takes place in several steps then its standard reaction enthalpy isa)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 35∘Cb)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperaturec)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 2 bard)the difference of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperatureCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for According to Hess’s Law if a reaction takes place in several steps then its standard reaction enthalpy isa)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 35∘Cb)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperaturec)the sum of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at 2 bard)the difference of the standard enthalpies of the intermediate reactions into which the overall reaction may be divided at the same temperatureCorrect answer is option 'B'. Can you explain this answer?.
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