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Q.

Calculate the mass of two helium atoms and choose the correct answer.


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a

4 N A

b

2 N A

c

8 N A

d

1 N A  

answer is C.

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Detailed Solution

Concept: You can determine the substance's molecular weight by dividing the specified number of atoms by Avogadro's number. By multiplying the mass of one atom by its number of moles, one can determine the mass of n atoms.
According to Avogadro’s constant, 1 mole of any atom contains N A an atom.
In the given question it's 2 atoms,
Moles of He= 2 N A
Atomic mass of He will be the weight of one mole of the given molecule,
1 mol=4 g
2 N A  moles mass=4 g× 2 N A = 8 N A
Hence, option 3 is the correct answer.
 
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