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Spontaneity of Reaction Calculator
Check whether a reaction is spontaneous using Gibbs free energy.
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ΔG
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Check whether a reaction is spontaneous using Gibbs free energy.
Spontaneity of Reaction Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: ΔG = ΔH – TΔS.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Spontaneity Quick Guide
Typical values for reference.
| ΔH kJ | ΔS J/K | T K | ΔG kJ |
|---|---|---|---|
| -92 | -199 | 298 | -32.7 kJ/mol |
| -92 | -199 | 500 | 7.5 kJ/mol |
| -92 | -199 | 1000 | 107.0 kJ/mol |
| 50 | 150 | 298 | 5.3 kJ/mol |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Spontaneity of Reaction Calculator FAQ
Answers to common questions about this calculator.
Sign.
It gives a quick estimate of spontaneity of reaction from the values you enter.
No. It is a planning estimate, so check important figures with a professional or official source.
Yes. Edit any field and the result updates when you calculate.