# Predict whether a molecule will decay due to heat.

• Tiiba

#### Tiiba

I'm trying to understand the chemistry of stars. At what point do molecules really end?

I guess there would be no one temperature where every molecule of hydrogen breaks apart in unison, but there should be an equation that says: if a diatomic gas is held together by 100 kJ/mol, at a temperature of 5000 kelvin it will be mostly individual atoms.

So, is there? I can't find anything.

(And if it's a complex situation for real gases, is there a formula that would make the same prediction for two hard spheres held together by a rubber band, or some other idealization?)

You could calculate the Boltzman factor to figure out the ratio of bound and unbound hydrogen atoms. (Though, this calculation would be imperfect as it would ignore the effect of entropy)

You can look up bond dissociation temperatures for all kinds of bonds. Then you can calculate the temperature required to break those bonds.

## 1. How can heat cause a molecule to decay?

Heat can increase the energy of a molecule, causing it to vibrate and potentially break apart. This can lead to the decay of the molecule.

## 2. What factors determine whether a molecule will decay due to heat?

The stability of the molecule's bonds, the amount of heat applied, and the surrounding environment can all affect whether a molecule will decay due to heat.

## 3. Are there any molecules that are more likely to decay due to heat?

Molecules with weaker or more unstable bonds are more likely to decay due to heat, as they require less energy to break apart.

## 4. Can the decay of a molecule due to heat be reversed?

In most cases, the decay of a molecule due to heat cannot be reversed. Once the bonds are broken, it is difficult to re-form them without significant energy input.

## 5. Is there a way to predict whether a molecule will decay due to heat?

Yes, there are various computational models and experimental methods that can be used to predict the likelihood of a molecule decaying due to heat. These include quantum mechanics calculations and spectroscopic techniques.