How many molecules of O2 are produced from 192 grams of
SeO2? 2Cu2O3 +8SeO2 -->4CuSe2 +11 O2

1 a

2 d

3 a

4 c

explanation:

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

i think it's c. i'm not sure but i think so.