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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


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