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11 January, 16:26

The sun is composed mostly of hydrogen. The mass of the sun is 2.0 * 10^30 kg, and the mass of a hydrogen atom is 1.67 * 10^-27 kg. Estimate the number of atoms in the sun.

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  1. 11 January, 16:46
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    Mass of the sun (Ms = 2.0 * 10^30 kg)

    mass of a hydrogen atom

    (Ma = 1.67 * 10^-27 or 5/3 * 10^-27 kg)

    number of atoms N = ... ?

    N = Ms / Ma

    = 2.0 * 10^30 / (5/3) * 10^-27

    = 1.2 * 10^57 atoms
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