Density of dry is air containing only N2 and O2 is 1.15 g/L at 740 mm

1.	Density of dry is air containing only N2 and O2 is 1.15 g/L at 740 mm and 300 K. what is % composition of N2 by weight ithe air -21.(1) 78%(2) 75.5%(3) 70.02%(4) 72.41%
Answer» PV = n RT= (m/M) RTWhere P is pressure, V is volume, n is number of moles R is a constanet and T is the kelvin temperature,m is the mass of gas and M is the molecular weight of the gas.Now we know that M= dRT /P =1.15 x .0821 x 300/ 740 /760 = 29.07gmol-1Now take W1is the mass fraction of nitrogen and 1-W1is the mass fraction of oxygenNow we get W1*28 + (1 - W1)32 = 29.07Now solving the above equation we get-4W1= -2.94So W1= 0.70So % of nitrogen is 70 by weight of the airhence option 3 is answer

Density of dry is air containing only N2 and O2 is 1.15 g/L at 740 mm and 300 K. what is % composition of N2 by weight ithe air -21.(1) 78%(2) 75.5%(3) 70.02%(4) 72.41%

Answer»

PV = n RT= (m/M) RTWhere P is pressure, V is volume, n is number of moles R is a constanet and T is the kelvin temperature,m is the mass of gas and M is the molecular weight of the gas.Now we know that

M= dRT /P

=1.15 x .0821 x 300/ 740 /760 = 29.07gmol-1Now take W1is the mass fraction of nitrogen and 1-W1is the mass fraction of oxygenNow we get W1*28 + (1 - W1)32 = 29.07Now solving the above equation we get-4W1= -2.94So W1= 0.70So % of nitrogen is 70 by weight of the airhence option 3 is answer

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