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?

Question

Quizplus · Accepted Answer

To find the number of hydrogen atoms, we need to divide the mass of the star by the mass of one hydrogen atom:

Number of hydrogen atoms = (mass of star) / (mass of one hydrogen atom)
= (8.0 × 10^30 kg) / (1.67 × 10^-27 kg)
= 4.79 × 10^57

Therefore, the approximate number of hydrogen atoms in the star is 4.8 × 10^57, which is closest to option C.

The Mass of a Star Is 8