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Heat exchanged in a chemical reaction at constant temperature and pressure is called
- a)entropy change
- b)enthalpy change
- c)internal energy change
- d)free energy change
Correct answer is option 'B'. Can you explain this answer?
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Heat exchanged in a chemical reaction at constant temperature and pres...
Heat exchanged in a chemical reaction at constant temperature and pressure is called enthalpy change.
Enthalpy Change:
Enthalpy is the sum of internal energy and the product of pressure and volume. Enthalpy change is the change in enthalpy during a reaction. It is represented by the symbol ΔH and is measured in joules per mole (J/mol). Enthalpy change can be positive or negative, depending on whether the reaction is endothermic or exothermic, respectively.
Constant Temperature and Pressure:
When a chemical reaction takes place at constant temperature and pressure, it is called an isobaric process. This means that the pressure and temperature remain constant throughout the reaction. In such a process, heat is exchanged between the system and the surroundings.
Entropy, Internal Energy, and Free Energy Change:
Entropy change is the change in the degree of disorder during a reaction and is represented by the symbol ΔS. Internal energy change is the change in the internal energy of the system during a reaction and is represented by the symbol ΔU. Free energy change is the change in the free energy of the system during a reaction and is represented by the symbol ΔG. These changes are related to each other by the following equation:
ΔG = ΔH - TΔS
where T is the temperature in Kelvin.
Conclusion:
Therefore, the correct answer is option B, enthalpy change, because it specifically refers to the heat exchanged during a chemical reaction at constant temperature and pressure.
Enthalpy Change:
Enthalpy is the sum of internal energy and the product of pressure and volume. Enthalpy change is the change in enthalpy during a reaction. It is represented by the symbol ΔH and is measured in joules per mole (J/mol). Enthalpy change can be positive or negative, depending on whether the reaction is endothermic or exothermic, respectively.
Constant Temperature and Pressure:
When a chemical reaction takes place at constant temperature and pressure, it is called an isobaric process. This means that the pressure and temperature remain constant throughout the reaction. In such a process, heat is exchanged between the system and the surroundings.
Entropy, Internal Energy, and Free Energy Change:
Entropy change is the change in the degree of disorder during a reaction and is represented by the symbol ΔS. Internal energy change is the change in the internal energy of the system during a reaction and is represented by the symbol ΔU. Free energy change is the change in the free energy of the system during a reaction and is represented by the symbol ΔG. These changes are related to each other by the following equation:
ΔG = ΔH - TΔS
where T is the temperature in Kelvin.
Conclusion:
Therefore, the correct answer is option B, enthalpy change, because it specifically refers to the heat exchanged during a chemical reaction at constant temperature and pressure.
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Heat exchanged in a chemical reaction at constant temperature and pressure is calleda)entropy changeb)enthalpy changec)internal energy changed)free energy changeCorrect answer is option 'B'. Can you explain this answer?
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