1) Dalton's law of partial pressures states that in a mixture of ideal gases, the total pressure is equal to the sum of the partial pressures of the individual gases. 2) The partial pressure of a gas is defined as the pressure that gas would exert if it alone occupied the entire volume at that temperature. 3) According to the ideal gas law, the partial pressure of each gas can be calculated using the formula Pk=(nkRT/V), where Pk is the partial pressure of the kth gas, nk is the number of moles of the kth gas, R is the ideal gas constant, T is the temperature, and V is the total volume.

1. PROPERTIES OF MIXTURE OF
GASES-DALTON’S LAW OF PARTIAL
PRESSURES
BY :JOHNS JOSEPH

2.  CONSIDER A HOMOGENEOUS MIXTURE OF INERT
IDEAL GASES AT,
 TEMPERATURE T
 PRESSURE P
 VOLUME V
 THERE ARE n1 MOLES OF GAS A1
 n2 MOLES OF GAS A2
 UPTO nc MOLES OF GAS AC
DALTON’S LAW OF PARTIAL
PRESSURES

3.  SINCE THERE IS NO CHEMICAL REACTION ,THE
MIXTURE IS IN A STATE OF EQUILIBRUM
DALTON’S LAW OF PARTIAL
PRESSURES

4.  EQUATION OF STATE :
PV=(n1+n2+………+nc)RT
R=8.3143KJ/Kg mol k
P=(n1RT/V)+(n2RT/V)+…………..+(ncRT/V)
The expression (nkRT/V) represent the pressure Kth
gas occuring a volume V along a temperature T
This is called partial pressure of the Kth gas and is
denoted by Pk
DALTON’S LAW OF PARTIAL
PRESSURES

5.  Thus P1=(n1RT/V),P2=(n2RT/V),…………Pc=(ncRT/V)
 P=P1+P2+…………………………..+Pc
 This Is known as Dalton’s Law of partial pressure
 It states that the total pressure of a mixture of ideal
gases is equal to the sum of the partial pressure
DALTON’S LAW OF PARTIAL
PRESSURES