Question

i) Define atomic mass unit.

ii) What is the numerical value of mole.

iii) Name the elements present in oxide ion.
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Answer 1

Answer:

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

One mole contains exactly 6.022 140 76 x 1023 elementary entities. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in the unit mol–1 and is called the Avogadro number.

An oxide (/ˈɒksaɪd/) is a chemical compound that contains at least one oxygen atom and one other element[1] in its chemical formula. "Oxide" itself is the dianion of oxygen, an O2– (molecular) ion. Metal oxides thus typically contain an anion of oxygen in the oxidation state of −2

Answer 2

Answer:

1)the mass unit equal to exactly one- twelfth the mass of one atom of carbon- 12 is called one atomic mass unit.

2)1 mole= 6.022× 10 power 3.

3)oxygen atom.