Calculate the number of oxygen atoms in 0.0073g of caso4 2.h2o?

> 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 letter a.

i believe the answer is 5,000