Thermochemistry

chocolates-xed SG

this topic is very hardd!

need help on this qn

Standard Enthalpy change of Formation of NaCl -414

Lattice Energy of NaCl -779

Hydration energy of gaseous sodium ions -390

Hydration energy of gaseous chloride ions -384

Standard enthalpy change of formation of aq NaCl -409

how to draw 2 different energy level diagrams to obtain 2 values for the enthalpy change of solution?

Eyelessz SG

Haha. One energy level cycle is Nacl (s) --> Nacl(aq)

Nacl(g)

2nd energy cycle requires you to have enthalpy change of atomisation ,

Na(s) + 1/2 cl2(g) ---> Nacl(aq)

Nacl(g)

chocolates-xed SG

hmmm ya. but how to draw on the energy level diagram the one that kind of looks like a graph? i read all the guidebooks for help, but all is those Ionic solids kind.