# What is the mass of an oxygen atom in amu if O = $2.6578\times 10^{-23}$ g Option 1) 16 µ Option 2) 18 µ Option 3) 17 µ Option 4) 15 µ

P Plabita

As we learnt in

Atomic Mass Unit -

amu is used to measure mass of individual atoms.

- wherein

mass of one atom of Helium= 4 amu

Today, ‘amu’ has been replaced by ‘µ’ which is known as unified mass.

$mass\;in\ \mu= \frac{2.6578\times 10^{-23}}{1.66056\times10^{-24}} \approx 16 \mu$

Option 1)

16 µ

Correct

Option 2)

18 µ

Incorrect

Option 3)

17 µ

Incorrect

Option 4)

15 µ

Incorrect

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