Question

Select the molecules with equal number of atoms?
( CO₂ , NaCI , NH₃ , H₂O , ZnCI₂ , SO₂,H₂O₂ )

Answer 1

Answer:

NH3 , H2O2 = 4 atoms.

CO2, H2O , ZnCl2 , SO2 = 3 atoms .

NaCl = 2 atoms

Answer 2

The molecules that have an equal number of atoms are:

(i) $\[N{H_3}\]$ and $\[{H_2}{O_2}\]$

(ii) $\[C{O_2}\]$ , $\[{H_2}O\]$, $\[ZnC{l_2}\]$ and $\[S{O_2}\]$

Explanation:

• The total number of atoms present in a molecule can be calculated by adding the number of atoms present in the molecule.
• The number of atoms present in the given molecules can be given as:

        $\[N{H_3}:1 + 3 = 4\]$

        $\[{H_2}{O_2}:2 + 2 = 4\]$

       $\[C{O_2}:1 + 2 = 3\]$

       $\[{H_2}O:2 + 1 = 3\]$

       $\[ZnC{l_2}:1 + 2 = 3\]$

       $\[S{O_2}:1 + 2 = 3\]$

       $\[NaCl:1 + 1 = 2\]$

• Thus, $\[N{H_3}\]$ and $\[{H_2}{O_2}\]$ have an equal number of atoms as both have 4 atoms in their molecules.
• Also, $\[C{O_2}\]$ , $\[{H_2}O\]$, $\[ZnC{l_2}\]$ and $\[S{O_2}\]$ have an equal number of atoms as all have 3 atoms in their molecules.