The value of enthalpy change for the process represented by the equation; (Na(s) ---> Na+(g) ΔH = ? ) is equal to:
Correct answer: C. ∆H°at of sodium + 1st I.E, of sodium
- A. I.E, of sodium
- B. ∆H, of sodium
- C. ∆H°at of sodium + 1st I.E, of sodium
- D. I.E, of sodium + ∆H of sodium
Explanation
The above equation shows that sodium atom in its solid state has converted to sodium atom in its gaseous state, therefore, enthalpy change of atomisation should be taken in account. Sodium atom has also converted into an ion with a +1 charge. This shows that it has been ionised and has lost one electron so we will take the first ionisation energy into consideration as well.
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 enthalpy change of a reaction does not depend on
Which one of the following reactions is spontaneous?
Which equation represents the change corresponding to the enthalpy change of atomisation of Iodine?
The net heat change in a chemical reaction is same whether it takes place in one step or more than one is known as
In exothermic reactions, the heat content of the:
A reaction gives out heat. This means that