Question

Determine the number of hydrogen atoms in the Sun. The mass of the Sun is 2×1030kg. About 70% of it by mass is hydrogen, 30% is helium, and there is a negligible amount of other elements.

Answer 1

Answer:

$8.36541\times 10^{56}$

Explanation:

Mass of the sum = $2\times 10^{30}\ kg$

70% of this mass is

$0.7\times 2\times 10^{30}=1.4\times 10^{30}\ kg$

Mass of hydrogen in the sun is $1.4\times 10^{30}\ kg$

Mass of a hydrogen atom = $1.6735575\times 10^{-27}\ kg$

Dividing the mass hydrogen in the sun by the mass of one hydrogen atom will give us the number of hydrogen atoms

$\frac{1.4\times 10^{30}}{1.6735575\times 10^{-27}}=8.36541\times 10^{56}$

The number hydrogen atoms in the Sun is $8.36541\times 10^{56}$