Question

li Derive the relationship between Relative molecules
mass and vapour density.​

Answer 1

Answer:

Vapour density is the density of a vapour in relation to that of hydrogen. It may be defined as mass of a certain volume of a substance divided by mass of same volume of hydrogen. vapour density = mass of n molecules of gas / mass of n molecules of hydrogen.

Answer 2

Answer:

${\huge{\sf{\red{\underline{\underline{ ÅÑSWËR}}}}}}$

$the \: relative \: vapour \: density \:$

of a gas (or a vapour)is:

• The ratio between the masses of equal volume of gas(or vapour) and hydrogen under the same condition of temperature and pressure.

Relative V.D.

Mass of volume 'v' of the gas under similar conditions/Mass of volume 'v' of hydrogen gas under similar conditions.

According to the Avogardro's Law,volume at the same temperature and pressure may be substituted by molecules.

Hence,

Reletive V.D.

Mass of 1 molecule of gas or vapour/Mass of 2 atoms of hydrogen.

(Molecule of hydrogen contains 2 atoms)By multiplying both sides by 2

2*Rel.V.D =

Mass of 1 molecule of gas or vapour/Mass of 1 atom of hydrogen.

2*Rel.V.D =

Rel.molecular mass of gas or vapour.

$the \: relative \: molecular \: mass \: of \: a \: gas \: or \: vapour \: is \: twice \: its \: vapour \: density$

hope its helpfull..