SI Unit of specific heat capacity is:
Correct answer: A. Jg-1K-1
- A. Jg-1K-1
- B. JK-1
- C. JmolK-1
- D. KJ/mol
Explanation
The correct answer is Jg-1K-1, which is the SI unit of specific heat capacity. Specific heat capacity (c) is defined as the amount of heat energy (in joules) required to raise the temperature of one gram of a substance by one degree Kelvin (or Celsius). Therefore, it is expressed in joules per gram per Kelvin.Option B (JK-1) is incorrect because it lacks the mass component, making it unsuitable for specific heat capacity. Option C (JmolK-1) refers to molar heat capacity, applicable to moles rather than grams, and is thus incorrect for this question. Finally, Option D (KJ/mol) also measures energy but in relation to moles, not grams, and therefore does not represent specific heat capacity.
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Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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