What is the typical percentage contribution of hydrogen to the total mass of a nebula?

Answer

Seventy-five percent or more

Hydrogen is unequivocally the most abundant component, often making up around seventy-five percent or more of the total mass of a nebula, reflecting the early universe composition.

What is the typical percentage contribution of hydrogen to the total mass of a nebula?
SpaceastronomycompositionnebulaGases