About 75% of the sun's mass comes from hydrogen, which amounts to about 1.5 * 1030 kilograms of hydrogen. Use this mass to calculate
how many hydrogen atoms are in the sun.

Today, the Sun continues to fuse hydrogen atoms to make helium in its core. It fuses about 600 million tons of hydrogen every second, yielding 596 million tons of helium. The remaining four million tons of hydrogen are converted to energy, which makes the Sun shine.