What fraction of the mass of a typical interstellar cloud is hydrogen?

Name: What fraction of the mass of a typical interstellar cloud is hydrogen?
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Interstellar clouds are composed mainly of gas and dust. The gas component is mostly hydrogen, with about 74% of the mass made up of hydrogen. The remaining gas is predominantly helium, with trace amounts of other elements. The dust component is made up of tiny solid particles, mostly made up of carbon, silicon, and oxygen.

What Fraction of the Mass of a Typical Interstellar Cloud