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Q. How much does mass of $NH_3$ contain same number of atoms as in $4\, g$ atom of oxygen?

Some Basic Concepts of Chemistry

Solution:

$4\, g$ atoms of oxygen $= 4\, mol$ of oxygen atoms
$= 4\, N_0$ atoms of oxygen
$1$ mole of $NH_3 .= N_0$ molecules $= 4\, N_0$ atoms $= 17\, g$