# 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

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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