Hi, if someone could help or even just guide me on how to solve this that would be great, It's chemistry Grade 11, Atomic mass/isotopic abundance question.

Arock can be broken down into different kinds of substances by physical processes. no chemical reactions are needed to separate different parts of a rock into pure substances. this is because a rock is a(n)

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

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?