Question

if one moles of oxygen atom weight 16 grams then what will be the mass ( in grams ) of 1 atam of oxygen

Answer 1

hey mate

To calculate the mass of a single atom, first look up the atomic mass of oxygen from the periodic table.
This number 16, is the mass in grams of one mole of oxygen. One mole of carbon is 6.022 x 10^23 atoms of carbon (Avogadro’s Number). This relation is then used to 'convert' a carbon atom to grams by the ratio:

mass of 1 atom / 1 atom = mass of a mole of atoms / 6.022 x 10^23 atoms

Plug in the atomic mass of carbon to solve for the mass of 1 atom:

> mass of 1 atom = mass of a mole of atoms / 6.022 x 10^23

> mass of 1 Oxygen atom = 16 g / 6.022 x 10^23 atoms

> mass of 1 Oxygen atom =2.65 x 10^-23 g.


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