Complete the following sentence.
measure air temperature and measure air pressure.

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

May someone me with these science questions

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2