How many oxygen atoms are there in the compound Cu(NO3)2 ?

Can someone me with these questions plz.

If a solution had a ph of 7 what is the solution

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together