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Answer:
1.08 grams
Explanation:
first, we need to find the number of moles
we divide 12.1/22.4=0.54 moles
we multiply the number of moles with the molecular mass 0.54x2=1.08g
The mass of the helium will be 0.296 g He.
The quantity of matter in a thing is measured by its mass. Grams (g) or kilograms (kg) are the most common units of mass measurement (kg).The quantity of matter is measured in terms of mass, regardless of where it is in the universe or the gravitational force acting on it.
Calculation of mass of helium:
It is given that, atom of He = 4.50 X [tex]10^{22}[/tex] , mass of He = 4 g.
4.50 X [tex]10^{22}[/tex] atoms He × 1 mole He / 6.02 × [tex]10^{23}[/tex] atom He = 0.0914 mol He.
Now, apply the conversion formula:
Moles He × grams He / 1 mole He = grams He.
Put the value of given data in above formula.
0.0914 mol He × 4 g / 1 mol He = 0.296 g He.
Therefore, the mass of the helium will be 0.296 g He.
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