At which of the following temperature standard enthalpies are measured?
Correct answer: B. 298K
- A. 373K
- B. 298K
- C. 350K
- D. All of these
Explanation
The correct answer is 298K, which is equivalent to 25°C. This temperature is considered the standard temperature for measuring and reporting standard enthalpies of formation or reaction. At this temperature, along with a pressure of 1 atm and 1 M concentration, the conditions are known as the standard state. The other options, 373K and 350K, do not represent standard conditions and are incorrect. Option 'All of these' is incorrect because not all given temperatures are standard conditions for enthalpy measurements.
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