Is hydrogen sulfide a heterogeneous mixture solution compound or element?

Hydrogen sulfide is a  compound

A compound is a substance composed of two or more element  in a fixed  proportion and it can be separated   into simpler substance   and element  only by chemical  method. Hydrogen sulfide is a chemical compound with H2S formula.

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.

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