Which is the most concentrated a 2M HCl solution or a 6 M HCl solution?

it is the most commonly accepted one

> 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.