Question

Calculate mass of 0.5 mole of nitrogen gas?

Answer 1

Given.

0.5 moles of nitrogen gas.

As we know, the atomic mass of nitrogen is 14g. Since nitrogen is always found in its molecular form, that is N₂

Therefore, the Molar mass of N₂ = 28g.

We know that

$$\begin{gathered} \mathrm{Number}\mathrm{of}\mathrm{moles}\left(\mathrm{n}\right)=\frac{\mathrm{Given}\mathrm{mass}}{\mathrm{Molar}\mathrm{mass}} \\ 0.5\mathrm{mol}=\frac{\mathrm{Given}\mathrm{mass}}{28\mathrm{g}{\mathrm{mol}}^{-1}} \\ \mathrm{Given}\mathrm{mass}=0.5\mathrm{mol}\times 28\mathrm{g}{\mathrm{mol}}^{-1} \\ \mathrm{Given}\mathrm{mass}=14\mathrm{g} \end{gathered}$$

Hence, the mass of 0.5 moles of nitrogen gas is 14g.