The enthalpies of free elements in their standard states are
Correct answer: B. Zero
- A. Unit
- B. Zero
- C. < zero
- D. Between Zero and one
Explanation
The enthalpies of free elements in their standard states are defined as zero. This is because the enthalpy change associated with the formation of an element from its most stable form in its standard state is considered to be zero by convention. This serves as a reference point for measuring the enthalpy changes of chemical reactions.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Practise Thermochemistry and Energetics of Chemical Reactions
728 free Thermochemistry and Energetics of Chemical Reactions MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Thermochemistry and Energetics of Chemical Reactions questions
The correct mathematical expression for the first law of thermodynamics
Ignition coil in bomb calorimeter
Which pair will show highest enthalpy of neutralization
Enthalpy of combustion of a substance is
Calculate enthalpy change in formation of NaHCO3(aq) using Hess' law:
According to first law of thermodynamics, if thermal energy is applied to water placed in a cylinder fitted with a frictionless piston: