If a mixture contained two compounds, a volatile compound and a nonvolatile compound, and this mixture was subjected to a distillation, which compound
would distill and which one would be left behind?

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c.  and at that point will start to turn into steam (gas)

The answer is a) carbon-12

Ibelieve its because the stove is a cleaner burning fuel