SI unit for energy change in a chemical reaction is:
Correct answer: C. Both A and B
- A. Joule mol-1
- B. KJ mol-1
- C. Both A and B
- D. None of these
Explanation
The SI unit for energy change in a chemical reaction is joules per mole. This means that the energy change is expressed in terms of the amount of energy released or absorbed per mole of reactants. For example, if the energy change for a reaction is -100 J/mol, this means that 100 joules of energy are released for every mole of reactants that react.The unit "joule" is a unit of energy, and the unit "mole" is a unit of amount of substance. So, joules per mole is a unit of energy per amount of substance. This is a useful unit because it allows us to compare the energy changes of different reactions that involve different amounts of reactants. Multiply it by 1000 to convert to KJ.
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About Thermochemistry and Energetics of Chemical Reactions
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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