Gaseous sulfur dioxide can be removed rom smokestacks by treatment with limestone and oxygen. 2SO2(g) + 2CaCO3(s) + O2(g) --> 2CaSO4(s) + 2CO2(g)

How many grams of CaSO4(s) are formed when 150.0g of SO2(g) are consumed?

a-319g
b-159g
c-136g
d-150g

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72