Which molecules show an appropriate number of bonds around each carbon atom?.

Can someone me with questions 12 and 13 plz.

Find the number of moles of argon in 364g of argon.

What changes occur in the reaction indicated by the equation? check all that apply. the hydrogen nucleus loses protons. the oxygen nucleus gains protons. the bond in h2 is broken, and new bonds are formed between hydrogen and oxygen atoms. each electron associated with a hydrogen atom is shared with an oxygen atom.