The mass of a star is 8.0 × 1030 kg, and the mass of a hydrogen atom is 1.67 × 10−27 kg. If we assume that the star is mostly composed of hydrogen, approximately how many atoms are there in the star?

The mass of a star is 8.0 × 1030 kg, and the mass of a hydrogen atom is 1.67 × 10−27 kg. If we assume that the star is mostly composed of hydrogen, approximately how many atoms are there in the star?

A. 1.3E+4 atoms

B. 2.1E-58 atoms

C. 4.8E+57 atoms

D. 8.0E+30 atoms

The answer is :

C. 4.8E+57 atoms