Its universal formula for hydrogen is: y = 2x+2-2 * ω.

Ω stands for unsaturation, and its calculation formula is:

Calculation formulas of carbon, hydrogen, oxygen, nitrogen and monovalent halogen;

ω= C+ 1-(H-N)/2

Where c represents the number of carbon atoms, h represents the total number of hydrogen atoms and halogen atoms, and n represents the number of nitrogen atoms. Oxygen and other divalent atoms do not contribute to the calculation of unsaturation, so there is no need to consider the number of oxygen atoms. This method is only applicable to compounds containing carbon, hydrogen, monovalent halogen, nitrogen and oxygen.

The number of hydrogen atoms can be obtained by adding the offspring of ω calculation to the universal hydrogen formula.

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