My Tutor atomic mass unit formula mass mass of hydrogen atom relative atomic mass relative formula mass Relative atomic mass

Relative atomic mass

Atom is the smallest unit that makes matter. Therefore it has a very tiny mass with which it is very difficult to perform chemical calculations.

e.g: Mass of an Hydrogen atom = 0.0000000000000000000000000166 Kg

It is thereby easy to use a relative value to express the mass of an atom.

For Example we can by comparing the mass of a Helium atom is Four times heavier than an atom of Hydrogen.

Even though Hydrogen atom has the smallest mass of all atoms it is not used as the atomic mass unit because Hydrogen has isotopes.

Standard atomic mass unit is there for one twelfth of the mass of the Carbon ¹²C isotope

Atomic mass unit= mass of the Carbon ¹²C isotope/ 12

Relative atomic mass unit is used as the standard for the comparison of the mass of other atoms.

Relative atomic mass= mass of the atom/ Atomic mass unit

E.g: Relative atomic mass of He= 4

N=14

Relative formula mass is the collection of the relative atomic masses of the atoms in a compound.

e.g: Relative formula mass of H2O= (1*2+16)= 18

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Arunigd 10:22 PM atomic mass unit formula mass mass of hydrogen atom relative atomic mass relative formula mass

Author : Arunigd

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