Question

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

Answer 1

around 0.304347826086957 so .3mol

Answer 2

Answer:

The number of molecules in 14.0g of $NO{_2}$ is 1.806* 10^23

Explanation:

We were given;

Mass = 14.0g of $NO{_2}$

First of all, we will calculate the molecular mass(MM) of $NO{_2}$

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 $NO{_2}$ 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, $NO{_2}$ 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 $NO{_2}$ is 1.806 × 10^23