Name: Molecules of Elements and Compounds
Uploaded: 2019-07-19
Duration: 3 min 34 s
Description: Each of us has different names to identify ourselves with, don’t we? In the same way, a molecule has a molecular formula to identify itself. Learn more about...

Question

In the table given below, write the number of molecules and the total number of atoms.

Substance	Number of molecules	Total number of atoms
$O_{2}$
$2 N_{2}$
$6 {Cl}_{2}$
$2 He$
$5 Na$
$O_{3}$
$P_{4}$

Accepted Answer

$O_{2}$ is an oxygen molecule which is diatomic and consists of $2$ atoms. Oxygen can't be found in its free form in the nature.

Substance Number of molecules Total number of atoms

$O_{2}$ $1$ $2$

$2 N_{2}$ is two molecules of nitrogen gas, which is a diatomic molecule. So the total number of atoms is $2 \times 2 = 4$ .

Substance Number of molecules Total number of atoms

$2 N_{2}$ $2$ $4$

$6 {Cl}_{2}$ is $6$ molecules of chlorine gas, which is a diatomic molecule. So the total number of atoms is $6 \times 2 = 12$ .

Substance Number of molecules Total number of atoms

$6 {Cl}_{2}$ $6$ $12$

$2 He$ contains $2$ helium molecules. Helium is a mono atomic molecule. So the total number of atoms is $2$ .

Substance Number of molecules Total number of atoms

$2 He$ $2$ $2$

$5 Na$ contains $5$ sodium molecules. Sodium is a monatomic molecule. So the total number of atoms is $5$ .

Substance Number of molecules Total number of atoms

$5 Na$ $5$ $5$

$O_{3}$ is an ozone molecule. It is a polyatomic (triatomic) molecule. So the total number of atoms is $3$ .

Substance Number of molecules Total number of atoms

$O_{3}$ $1$ $3$

$P_{4}$ is a phosphorus molecule. It is a polyatomic molecule. So the total number of atom is $4$ .

Substance Number of molecules Total number of atoms

$P_{4}$ $1$ $4$

Compound, molecules and atoms
Water	_____
Sugar	_____

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