An elementary reaction converts reactants to products in a single step never needs a catalyst has only elements as products has only elements as reactants description

a galvanic cell( aka voltaic cell) and electrolytic cell

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> 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.