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Need explanation for: - Some basic concepts in chemistry - JEE Main

What is the mass of one Helium atom in µ if its mass in g is 6.646629\times 10^{-24} g ?

  • Option 1)

    4

  • Option 2)

    3.998

  • Option 3)

    4.0026

  • Option 4)

    4.568

 
Answers (1)
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As we learnt in 

Relation between amu and Gram -

12C is assigned a mass of exactly 12 atomic mass unit (amu).

1 amu = 1.66056×10–24 g

-

 

 mass\;in\ \mu = \frac{6.646629\times 10^{-24}}{1.66056\times10^{-24}} = 4.0026 \mu


Option 1)

4

Incorrect

Option 2)

3.998

Incorrect

Option 3)

4.0026

Correct

Option 4)

4.568

Incorrect

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