Question

The ration between the number of atoms in equal masses of Hydrogen and Helium

Answer 1

hii friend...

A helium atom has two electrons and a nucleus with two protons and two neutrons. 

A hydrogen atom has one electron and only one proton. Now suppose you replaced one atom of hydrogen in the center of the star wih an atom of helium.

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Answer 2

Answer: The ration between the number of atoms in equal masses of Hydrogen and Helium: 2:1

Explanation:

Consider we have 1 gram of Hydrogen and helium

Number of moles of $H_2$ gas in 1 grams =

${\text{mass of the Hydrogen}}{\text{Molecular mass of Hydrogen}}=\frac{1}{2}$ = 0.5 moles

Number of Hydrogen gas molecules in 0.5 moles =

$0.5 mol\times N_A=0.5 mol\times 6.022\times 10^{23} mol^{-1}=3.011\times 10^{23}$

Number of Hydrogen atoms in 0.5 mol of $H_2$ = Number of Hydrogen gas molecules $\times 2$ = $6.022\times 10^{23}$ atoms. (There are two atoms in one molecule of $H_2$ gas)

Number of moles of $He$ gas in 1 gram =

${\text{mass of the Helium}}{\text{Molecular mass of Helium}}=\frac{1}{2}$ = 0.5 moles

Number of Helium gas molecules in 0.5 moles =$0.5 mol\times N_A=0.5 mol\times 6.022\times 10^{23} mol^{-1}=3.011\times 10^{23}$ atoms

Since Helium is a mono-atomic gas

So, the number of Helium atoms in 0.5 moles =$6.022\times 10^{23}$atoms

The ration between the number of atoms in equal masses of Hydrogen and Helium:

Number of hydrogen atoms in 1 gram of hydrogen : Number of Helium atoms in 1 gram of Helium = $6.022\times 10^{23} atoms:3.011\times 10^{23}atoms=2:1$

The ration between the number of atoms in equal masses of Hydrogen and Helium: 2:1