What are the three main parts of the sun

The core,radiative zone and convective zone.

The three major structural areas of the sun are
Core -- The center of the sun, comprising 25 percent of its radius.
Radiative zone --The section immediately surrounding the core, comprising 45 percent of its radius.
Convective zone -- The outermost ring of the sun, comprising the 30 percent of its radius. Above the surface of the sun is its atmosphere, which consists of three parts
Photosphere -- The innermost part of the sun's atmosphere and the only part we can see.
Chromosphere -- The area between the photosphere and the corona; hotter than the photosphere.
Corona -- The extremely hot outermost layer, extending outward several million miles from the chromosphere.

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged

Go ask spider man