Using the table above, calculate the atomic mass of the unknown element. Identify the element (use its full name, not its atomic symbol).

> 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.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a