DuckieDai Gibbs Free Energy Python Program

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chemistry · MIT License

Overview

Calculate Delta G from Delta H, Delta S, and T or relate standard Gibbs energy to a dimensionless equilibrium constant.

Usage

Inputs

Delta H in kJ/mol, Delta S in J/(mol*K), and temperature in K
Dimensionless equilibrium constant K or standard Delta G in kJ/mol

Outputs

Delta G in kJ/mol or equilibrium constant K
A sign or equilibrium-position interpretation with stated boundaries

Units: Temperature is kelvin; energy is kJ/mol; entropy input is J/(mol*K); R is 0.008314 kJ/(mol*K); K is dimensionless.

Assumptions and limitations

Assumptions

Delta H and Delta S are treated as temperature-independent for Delta G = Delta H - T*Delta S.
The K relation uses standard-state Delta G and a thermodynamic, dimensionless equilibrium constant.

Constraints

Temperature and K must be positive; signed thermodynamic changes are accepted.

Known failures

The sign of Delta G describes thermodynamic direction under stated conditions, not reaction rate.
Very large positive Delta G can underflow K to zero at display precision.

Compatibility and review

Review status: Not calculator tested
Tested on: The owner reports personally testing the supplied archive programs on a calculator; exact model, OS, and Python App versions were not recorded
What happened: Owner reported interactive testing is disclosed, but the published bytes are not labeled independently calculator tested because the environment is unrecorded and Arrhenius received a narrow intake correction
Dependencies: math
Suggested calculator name: GIBBS — you can give it another valid, unique name when you transfer it
Desktop test cases: Not available for this interactive-only source

This exact source auto-launches an interactive calculator session, so compatibility evidence comes from the recorded physical-device review rather than an importable desktop fixture.

Browser preview

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Exact reviewed bytes

Source code

Download .py

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from math import log,exp

R=.008314

def duckiedai_intro(program_name,wait=True):
 title=program_name[:16]
 empty=16-len(title)
 left=empty//2
 right=empty-left
 print("+----------------------+")
 print("|   "+" "*left+title+" "*right+"   |")
 print("|                      |")
 print("|       __             |")
 print("|   ___(o )>  quack!   |")
 print("|   \\ <_. )           |")
 print("|    `---'             |")
 print("|     by DuckieDai     |")
 print("+----------------------+")
 print("Loading...")
 if wait:
  input("Press enter to start ")
  print("\n"*6)

def num(s):
 while 1:
  try:return float(input(s))
  except:print("Enter a number")

def pos(s):
 while 1:
  x=num(s)
  if x>0:return x
  print("Must be positive")

def menu():
 while 1:
  try:
   x=int(input("Choose 1-3: "))
   if x>0 and x<4:return x
  except:pass
  print("Choose 1 to 3")

def dg_type(g):
 if abs(g)<1e-7:print("AT EQUILIBRIUM")
 elif g<0:print("SPONTANEOUS")
 else:print("NONSPONTANEOUS")

def k_type(k):
 if abs(k-1)<1e-7:print("K=1 equilibrium")
 elif k>1:print("Products favored")
 else:print("Reactants favored")

duckiedai_intro("GIBBS ENERGY")
print("GIBBS FREE ENERGY")
print("1 DG from H,S,T")
print("2 DG from K")
print("3 K from DG")
c=menu()

if c==1:
 h=num("DH kJ/mol: ")
 s=num("DS J/mol K: ")
 t=pos("Temp K: ")
 g=h-t*s/1000
 print("DG kJ/mol =",g)
 dg_type(g)

elif c==2:
 k=pos("K: ")
 t=pos("Temp K: ")
 g=-R*t*log(k)
 print("DG kJ/mol =",g)
 dg_type(g)
 k_type(k)

else:
 g=num("DG kJ/mol: ")
 t=pos("Temp K: ")
 try:
  k=exp(-g/(R*t))
  print("K =",k)
  k_type(k)
 except:print("K too large")

input("ENTER for guide: ")
print("QUICK GUIDE")
print("DG<0: spontaneous")
print("DG>0: nonspontaneous")
print("K>1: products")
print("K<1: reactants")
print("DuckieDai: done!")
input("ENTER to exit: ")

from math import log,exp
R=.008314
def duckiedai_intro(program_name,wait=True):
title=program_name[:16]
empty=16-len(title)
left=empty//2
right=empty-left
print("+----------------------+")
print("| "+" "*left+title+" "*right+" |")
print("| |")
print("| __ |")
print("| ___(o )> quack! |")
print("| \\ <_. ) |")
print("| `---' |")
print("| by DuckieDai |")
print("+----------------------+")
print("Loading...")
if wait:
input("Press enter to start ")
print("\n"*6)
def num(s):
while 1:
try:return float(input(s))
except:print("Enter a number")
def pos(s):
while 1:
x=num(s)
if x>0:return x
print("Must be positive")
def menu():
while 1:
try:
x=int(input("Choose 1-3: "))
if x>0 and x<4:return x
except:pass
print("Choose 1 to 3")
def dg_type(g):
if abs(g)<1e-7:print("AT EQUILIBRIUM")
elif g<0:print("SPONTANEOUS")
else:print("NONSPONTANEOUS")
def k_type(k):
if abs(k-1)<1e-7:print("K=1 equilibrium")
elif k>1:print("Products favored")
else:print("Reactants favored")
duckiedai_intro("GIBBS ENERGY")
print("GIBBS FREE ENERGY")
print("1 DG from H,S,T")
print("2 DG from K")
print("3 K from DG")
c=menu()
if c==1:
h=num("DH kJ/mol: ")
s=num("DS J/mol K: ")
t=pos("Temp K: ")
g=h-t*s/1000
print("DG kJ/mol =",g)
dg_type(g)
elif c==2:
k=pos("K: ")
t=pos("Temp K: ")
g=-R*t*log(k)
print("DG kJ/mol =",g)
dg_type(g)
k_type(k)
else:
g=num("DG kJ/mol: ")
t=pos("Temp K: ")
try:
k=exp(-g/(R*t))
print("K =",k)
k_type(k)
except:print("K too large")
input("ENTER for guide: ")
print("QUICK GUIDE")
print("DG<0: spontaneous")
print("DG>0: nonspontaneous")
print("K>1: products")
print("K<1: reactants")
print("DuckieDai: done!")
input("ENTER to exit: ")

Filename: gibbs.py
Size: 1808 bytes
SHA-256: f769c7eb1f0f7d39975b4219deccf44dd5da9ed62f0d99a831b3fcd0675813c7

Transfer and launch

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Download the .py source above and verify its SHA-256 digest if your computer provides that option.
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Version history

1.0.0 — current version, published 2026-09-23. Download this reviewed version

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