Question

What happens if all of the hydrogen in the sun turns into helium

Answer 1

The Sun will expand to a red giant which fuses helium to carbon and oxygen in its core by the Triple Alpha Process.

Answer 2

When all the hydrogen is converted to helium the Star rearranges itself, its core shrinks and its outer layers expand, depending on its initial mass the Star then transforms into a giant or a super-giant

Step-by-step explanation: