Enthalpy

Question 1

Lattice Enthalpy ∆H_LE

Answer 1

The enthalpy change that occurs when one mole of an ionic lattice is formed from its isolated gaseous ions

Question 2

Entalpy Of Formation ∆H_f

Answer 2

The enthalpy change that occurs when one mole of a compound is formed from its elements in their standard states

Question 3

Enthalpy Change Of Atomisation ∆H_AT

Answer 3

The Enthalpy Change that occurs when one mole of gaseous atoms are formed from an element

Question 4

First Ionisation Energy

Answer 4

The Energy required to remove one mole of electrons from one mole og gaseous atoms to form one mole of gaseous 1+ ions

Question 5

Electron Affinity

Answer 5

Enthalpy change when one mole of gaseous atoms acquires one mole of electrons to form one mole of 1- ions.

Question 6

Enthalpy Change of Hydration ∆H_hyd

Answer 6

enthalpy change that occurs when one mole of gaseous ions dissolves in (an excess of) water (to give an infinitely dilute solution)

Question 7

Enthalpy Change of Solution ∆H_sol

Answer 7

The enthalpy change that occurs when one mole of a solute dissolves (in an excess of) solvent (to give an infinitely dilute solution)

Question 8

Born Haber Cycle…
with MgCl₂

Answer 8

1) enthalpy of formation of MgCl₂
2) enthalpy of atomisation of Mg
3) enthalpy of atomisation of Cl x2
4) 1^st ionisation energy of Mg
5) 2^nd ionisation energy of Mg
6) Electron affinity of Cl x2
7) Lattice enthalpy of MgCl₂
1,-2,-3,-4,-5=6+7

Question 9

Born Haber With Enthalpy of Sol

Answer 9

Hydration Enthalpy = Lattice ethalpy + Enthalpy of Solution