If the actual yield of the reaction is 30.61 grams of CO, what is the percent
yield?

thats how its supposed to be

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

that's what i got you can count the number of atoms

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