Question

what is the mass of the reference atom for atomic mass scale

Answer 1

$\huge{HELLO -DEAR}$
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Answer: -> It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, 1.992646547 × 10−23 gram, which is assigned an atomic mass of12 units. In this scale 1 atomic mass unit (amu) corresponds to 1.660539040 × 10−24 gram.

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Hope its hlp UHH

Answer 2

It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, 1.992646547 × 10−23 gram, which is assigned an atomic mass of12 units. In this scale 1 atomic mass unit (amu) corresponds to 1.660539040 × 10−24 gram.