Vapour density of methane is___________-

Part: 1: Introduction of Vapor density

• At the same temperature and pressure conditions, the relative density of a gas or vapor to that of Hydrogen$\left(H_2\right)$ is called vapor density.
• Vapor density is the ratio of the molar mass of gas and the molar mass of Hydrogen$\left(H_2\right)$.
• The molar mass of Hydrogen$\left(H_2\right)$is equal to $2\frac{g}{mol}$

So,

$$\begin{gathered} Vapordensity=\frac{molarmassofgas}{molarmassofHydrogen\left(H_2\right)} \\ Vapordensity=\frac{molarmassofgas}{2{\displaystyle \frac{g}{mol}}} \end{gathered}$$

Part:2: Calculation of Methane$\left(C{H}_4\right)$ vapor density:

1. The molar mass of the methane$\left(C{H}_4\right)$ is $16\frac{g}{mol}$
2. The vapor density will be

$$\begin{gathered} Vapordensity=\frac{molarmassofMethane\left(C{H}_4\right)}{2{\displaystyle \frac{g}{mol}}} \\ Vapordensity=\frac{16{\displaystyle \frac{g}{mol}}}{2{\displaystyle \frac{g}{mol}}} \\ Vapordensity=8 \end{gathered}$$

Therefore, methane$\left(C{H}_4\right)$ vapor density is 8.