Determine the number of molecules in 14.0 g of nitrogen dioxide (NO2).

The number of molecules in 14.0g of is 1.806* 10^23

Explanation:

We were given;

Mass = 14.0g of

First of all, we will calculate the molecular mass(MM) of

Atomic number of Nitrogen, N=14  

Atomic number of Oxygen, O=16

MM of NO_2 = (14+{16*2})

MM of NO_2 = (14+32) = 46g/mol

Also, we find the number of moles in using the formula below;

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molecular mass}}

\text{Number of moles}=\frac{14}{46}

\text{Number of moles}=0.3moles

Nitrogen dioxide, therefore has 0.3moles.

In Chemistry, we know 1\text{ mole}=6.022\times 10^{23}\text{ molecules}

So, 0.3\text{ mole}=6.022\times 10^{23}\times 0.3\text{ molecules}

0.3\text{ mole}=1.806\times 10^{23}\text{ molecules}

Therefore, The number of molecules in 14g of is 1.806 × 10^23

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

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