Which element has 5 protons 5 neutrons and 5 electrons

One or more substances changing into one or more substances is an example of a

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 would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same