Which stays the same during chemical reactions?
the overall types of atoms only
the overall numbers of atoms only
both the overall types and numbers of atoms
neither the overall types or numbers of atoms

Both the overall types and numbers of atoms stay the same during chemical reactions.

there is none because earth is stationary and flat.

> 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.