Avogadro's Law All Numerical,Notes,Pdf,Clear Cut, Solved ,Unsolved Questions Class 11 and 12

Avogadro's Law All Numerical,Notes,Pdf,Clear Cut, Solved ,Unsolved Questions Class 11 and 12

AVOGADRO'S HYPOTHESIS

Avogadro's number (N_A) = 6.023 x 10^23 particles

Vapour density of gas (V.D.)= Ratio of Mass of certain volume of gas  to Mass of same volume of H2 gas at NTP or similar condition of T and P 

 Molecular mass = 2 x vapour density

Molar volume of a gas = 22.4 liter at NTP

Weight of 1 L gas at NTP= 0.089g

Solved

1. An oxide of nitrogen contains its half volume of nitrogen and its vapour density is 15

Determine its molecular formula. [HSEB]

Solution:

Oxide of Nitrogen is formed by combination of nitrogen and Oxygen.

Let, molecular formula of oxide of nitrogen = NxOy.

Where, x = no. of N — atoms.

y = no. of O — atoms.

Given, volume of oxide of nitrogen=(1/2) of volume of nitrogen.

Again,

Let, Volume of oxide of nitrogen be 'V' volume which contains n - molecules.

Now,

Nitrogen gas + oxygen gas —  —  —  —  — >> oxide of nitrogen.

V/2 volume + oxygen gas  —  —  —  —  — >> V volume

n/2 molecules + ............—  —  —  —  — >> n — molecules (By applying Avogadro's law)

1/2 molecules +............ —  —  —  —  — >> 1 — molecule

1 — atom +...........—  —  —  —  — >> 1 — molecule (NxOy)

Since, nitrogen is diatomic molecule so according to balanced equation, oxide of nitrogen contains

No. of N — atoms (X)= 1

Then,

V.D. of oxide of nitrogen =15

Mol. wt. of oxide of nitrogen (NxOy) =2 x 15= 30 amu

 

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