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Question

1 u or 1 amu (atomic mass unit) is equal to ___.

A
(116)th of the mass of an atom of oxygen.
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B
(112)th of the mass of one atom of carbon 12.
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C
12 carbon atoms.
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D
16 oxygen atoms.
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Solution

The correct option is B (112)th of the mass of one atom of carbon 12.

Carbon -12 isotope is used as the standard reference for measuring atomic masses.
1 atomic mass unit is a mass unit equal to exactly (112)th the mass of one atom of carbon 12.

It is expressed as u or amu.


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