PLEASE HELP ME, I have no idea how to do this :(

The table describes how some substances were formed substance 19 description formed by boiling pure water formed by combining three hydrogen atoms to every nitrogen atom formed by adding 5 g of sugar to 1 l of water formed by compressing carbon under high pressure based on the given descriptions, which substance is most likely a mixture?

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

Ill give u brainliest pls how is mass of carbon conserved during cellular respiration