HELP NEEDED, ASAP How many grams of calcium carbonate are decomposed to produce 22.4 L of carbon dioxide at STP? (At. Masses: Ca = 40, C = 12, O = 16)
Select one:
a. 50 grams
b. 1000 grams
c. 90 grams
d. 100 grams

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

> 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.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".