Unsaturation and stability

A hydrocarbon has a molecular formula. You will find how many rings and pi bonds it holds, and compare two isomers by their heats of hydrogenation.

The idea. The degree of unsaturation is $(2C + 2 - H)/2$ for a molecule of carbon and hydrogen only. The isomer that gives out less heat on hydrogenation is the more stable.

Your tasks.

1. Set unsaturation to the degree of unsaturation of the formula.
2. Set heat_cis_total to the heat given out by the amount of the cis alkene, in kJ.
3. Set gap to how many kJ/mol more stable the trans isomer is than the cis isomer.
4. Set more_stable to the word "trans" or "cis", whichever is the more stable.