badge image

Enroll For Free Now & Improve Your Performance.

User Icon
User Icon
User Icon
User Icon
User Icon

Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.

Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: Rs.

There are no items in this cart.
Continue Shopping


1.a sample of supercooled water is allowed to form ice at -5degree celsius at 1 atm,it is given that density of water and ice are 0.999 and 0.917 gm per cc, calculate chanfe in gibbs free energy and helmholtZ energy.

9 years ago

Answers : (1)

879 Points

Dear student,

The Gibbs Free Energy is a thermodynamic quantity which can be used to determine if a reaction is spontaneous or not. The definition of the Gibbs free energy is

G = H- T*S

where G is the free energy, H is the enthalpy and S is the entropy. If we consider the change in G for a reaction where the temperature does not change, we have


DH and DS are computed from the usual procedures. Temperatures for this equation must be in Kelvin. The above equation is often known as the "Gibbs-Helmholtz equation". Since the values of DH and DS are usually gotten from tables of standard entropy and enthalpy, the Gibbs free energy change usually computed is the standard Gibbs free energy change, DG0 at 250C- for different temps the procedure is similar

The sign of DG determines if a reaction is spontaneous or not.

  • DG < 0: the reaction is spontaneous
  • DG > 0: the reaction is not spontaneous
  • DG = 0: the reaction is at equilivrium


Please feel free to ask your queries here. We are all IITians and here to help you in your IIT JEE preparation.

All the best.

Win exciting gifts by answering the questions on Discussion Forum. So help discuss any query on askiitians forum and become an Elite Expert League askiitian.

Now you score 5+15 POINTS by uploading your Pic and Downloading the Askiitians Toolbar  respectively : Click here to download the toolbar..


Askiitians Expert

Sagar Singh

B.Tech, IIT Delhi

9 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies

Course Features

  • 728 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution

Course Features

  • 731 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!! Click Here for details