January 16, 2025, 02:49:04 PM
Forum Rules: Read This Before Posting


Topic: Help in thermodynamics  (Read 3361 times)

0 Members and 2 Guests are viewing this topic.

Offline vijay_cluster

  • Regular Member
  • ***
  • Posts: 11
  • Mole Snacks: +0/-0
Help in thermodynamics
« on: December 06, 2009, 02:56:43 AM »
The lattice energy of solid NaCl is 180 K.Cal per. mole. The dissolution of the solid in water in the form of ions is endothermic to the extent of 1KCal per. mole. if the solvation energies of Na+ and Cl- are in the ratio 6 : 5 , what is the enthalpy of hydration of sodium ion? the answer is given as -97.5 Kcal/ mole . how is this possible can any one help me

Offline plankk

  • Full Member
  • ****
  • Posts: 150
  • Mole Snacks: +20/-4
  • Gender: Female
Re: Help in thermodynamics
« Reply #1 on: December 10, 2009, 03:53:34 AM »
Try to draw a thermodynamic cycle and use Hess's law to find the total enthalpy of hydration of both ions. Then use a given ratio.

Sponsored Links