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Grade: 12th pass
        
The dencity of a mixture of O2 and N2 at NTP is 1.3 g/liter what is the partial pressure of N2
22 days ago

Answers : (1)

Arun
15843 Points
							
Dear Rahul
 
 

CONSIDER A MIXTURE OF N2 AND O2  AT STP DENSITY IS GIVEN TO BE 1.3 g/L CONSIDER THE TOTAL VOLUME TO BE 1L THEN THE TOTAL WEIGHT OF THE MIXTURE WILL BE 1.3 gm SINCE DENSITY=MASS/VOLUME  . NOW CONSIDER THE VOLUME OF N2 BE ''a'' L THEREFORE VOLUME OF O2 WILL BE ''1-a'' L  AND ALSO MASS OF N2 BE ''b''gm THEREFORE MASS OF O2 WILL BE ''1.3-b''gm    NOW AT STP AND NTP MOLES = VOLUME(LITRES)/22.4  THEREFORE

 FOR N2 MOLECULAR MASS IS 28 THEREFORE AND SINCE MOLES = WT/MOLECULAR MASS

 b/28=a/22.4........................(1)

 FOR O2 MOLECULAR MASS IS 32 gm THEREFORE

 (1.3-b)/32=(1-a)/22.4......................(2)

 YOU HAVE TWO EQUATION TWO VARIABLES SOLVE FOR ''a'' AND ''b'' AND NOW THEY ARE ASKIN FOR PARTIAL PRESSURE OF O2

 NOW YOU KNOW THE VOLUME OF O2 AND MASS OF O2

 (PRESSURE OF O2) =(MOLEFRACTION OF O2] * TOTAL PRESSURE.........{TOTAL PRESSURE IS 1 ATM AND MOLEFRACTION = MOLES OF O2/TOTAL MOLES}

TOTAL MOLES CAN BE CALCULATED OCE YOU GET THE VALUE F ''a'' and ''b''...............

22 days ago
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