Question

proof that PV=nRT. .

Answer 1

According to Boyle's law 
V∝1P
and According to Charle's law
V∝T
According to Avogadro's law
V∝n
Joining all the above equations we get,
V∝nTP
V= constant nTP
V= RnTP (R=General gas constant)
PV=nRT
This is called an Ideal gas equation or general gas equation.

Answer 2

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Ideal Gas Equation

Let us consider the pressure exerted by the gas to be ‘p,’

The volume of the gas be – ‘v’

Temperature be – T

n – be the number of moles of gas

Universal gas constant – R

According to Boyle’s Law,

At constant n & T, the volume bears an inverse relation with the pressure exerted by a gas.

i.e. v∝1/p ………………………………(i)

According to Charles’ Law,

When p & n are constant, the volume of a gas bears a direct relation with the Temperature.

i.e. v∝T ………………………………(ii)

According to the Avogadro’s Law,

When p & T are constant, then the volume of a gas bears a direct relation with the number of moles of gas.

i.e. v∝n ………………………………(iii)

Combining all the three equations, we have-

v∝nT/p

or pv=nRT

where R is the Universal gas constant, which has a value of 8.314 J/mol-K.

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