Question

The mass of one molecules of a substance is 4.65*10 -23 g. What is its molecular mass? What could this substance be ?

Answer 1

Given :

• Mass of one molecule of a substance = 4.65 × 10⁻²³ g

To find :

• The molecular mass and the substance

Solution :

Mass of one molecule of a substance is given by ,

$\boxed {\rm{m = \frac{molecular \: mass}{avagadro \: number} }}$

We have ,

• Mass of one molecule = 4.65 × 10⁻²³ g
• Avagadro number = 6.023 × 10²³

By substituting the values ,

$: \implies \rm\: 4.65 \times {10}^{ - 23} = \frac{molecular \: mass}{6.023 \times {10}^{23} } \\ \\ : \implies \rm \: molecular \: mass = 4.65 \times {10}^{ - 23} \times 6.023 \times {10}^{ 23} \\ \\ : \implies \rm \: molecular \: mass = 4.65 \times 6.023 \\ \\ : \implies \rm \: molecular \: mas \approx \: 28$

Hence , The molecular mass of the substance is 28 .

Nitrogen molecule has a mass of 28 . Hence , The substance is Nitrogen molecules

Answer 2

Answer:

Given :

Mass of one molecule of a substance = 4.65 × 10⁻²³ g

To find :

The molecular mass and the substance

Solution :

Mass of one molecule of a substance is given by ,

\boxed {\rm{m = \frac{molecular \: mass}{avagadro \: number} }}

m=

avagadronumber

molecularmass

We have ,

Mass of one molecule = 4.65 × 10⁻²³ g

Avagadro number = 6.023 × 10²³

By substituting the values ,

\begin{gathered} : \implies \rm\: 4.65 \times {10}^{ - 23} = \frac{molecular \: mass}{6.023 \times {10}^{23} } \\ \\ : \implies \rm \: molecular \: mass = 4.65 \times {10}^{ - 23} \times 6.023 \times {10}^{ 23} \\ \\ : \implies \rm \: molecular \: mass = 4.65 \times 6.023 \\ \\ : \implies \rm \: molecular \: mas \approx \: 28\end{gathered}

:⟹4.65×10

−23

=

6.023×10

23

molecularmass

:⟹molecularmass=4.65×10

−23

×6.023×10

23

:⟹molecularmass=4.65×6.023

:⟹molecularmas≈28

Hence , The molecular mass of the substance is 28 .

Nitrogen molecule has a mass of 28 . Hence , The substance is Nitrogen molecules