Calculate the total number of electrons present in 1.4 g of dinitrogen gas.

Exercises · 5.13

Q. Calculate the total number of electrons present in 1.4 g of dinitrogen gas.

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Step 1 – Moles of N $_2$

n(\text{N}_2) = \frac{1.4\ \text{g}}{28\ \text{g mol}^{-1}} = 0.05\ \text{mol}

Step 2 – Number of N $_2$ molecules (Avogadro's number)

N(\text{N}_2) = 0.05 \times 6.022\times10^{23} = 3.011\times10^{22}\ \text{molecules}

Step 3 – Electrons per N $_2$ molecule

Nitrogen has atomic number $Z=7$ , so each N atom has 7 electrons; N $_2$ has: …

Q.Calculate the total number of electrons present in 1.4 g of dinitrogen gas.