Question

define atomic mass unit (amu). calculate mass of one oxygen atom in terms of amu (Avogrades no. =2.656×10-²³) ​

Answer 1

Answer:

a unit of mass used to express atomic and molecular weights, equal to one twelfth of the mass of an atom of carbon-12.

Atomic weight of oxygen=16g/mol

1 mol oxygen atom contains 6.023×10 ^23 =16g

Mass of ⇒6.023×10 ^23oxygen atoms =16g

Mass of 1 atom of oxygen = 16g/6.023×10 ^23

= 2.66×10 ^−23 g