Vapour density of volatile substance ia 4 (CH4=1) its molecular mass is ?

Question

Answer

64

Answer

Vapour density of a volatile substance is 4 in comparison to CH4=1. what will be its molecular mass?

Answer

The molecular weight or the molar mass would be 64 because vapor density is related with molecular mass as

molar mass 2×V.D

In methane CH4 molar mass =16

Thus vapor density =162=8

Here relative vapor density is 4 for the substance so it is =8×4=32

Hence Molar mass of the substance =2×32=64

Answer

Ans=16×4=64

Answer

Explanation of Vapour Density and its Calculation

Vapour density is a term used to describe the density of a gas or vapor compared to the density of hydrogen gas. It is a useful parameter in determining the molecular mass of a substance. The vapour density of a volatile substance is defined as the ratio of the mass of a given volume of the substance to the mass of the same volume of hydrogen gas under the same conditions of temperature and pressure.

Calculation of Molecular Mass

To calculate the molecular mass of a substance using its vapour density, we need to know the vapour density of the substance and the vapour density of hydrogen gas. The vapour density of hydrogen gas is considered to be 1, so we can use it as a reference point.

The molecular mass of a substance can be calculated using the following formula:
Molecular mass = (Vapour density) x (Molar mass of hydrogen gas)

Example Calculation

Let's consider an example where the vapour density of a volatile substance is given as 4 (with respect to methane, CH4, which has a vapour density of 1). We can use this information to calculate the molecular mass of the substance.

Using the formula mentioned above,
Molecular mass = (4) x (Molar mass of hydrogen gas)

The molar mass of hydrogen gas is approximately 2 grams per mole. Therefore,
Molecular mass = (4) x (2) = 8 grams per mole

Hence, the molecular mass of the volatile substance is 8 grams per mole.

Conclusion

In conclusion, the vapour density of a volatile substance is used to determine its molecular mass. By comparing the vapour density of the substance with the vapour density of hydrogen gas, we can calculate the molecular mass using the formula mentioned earlier. In the given example, the molecular mass of the substance was found to be 8 grams per mole.

Answer

Mwt is 64

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