Find the density (in g/L) of NO_2 (g) and the number of molecules per liter (a)

Q: Find the density (in g/L) of NO_2 (g) and the number of molecules per liter (a)

a) Abs T at STP --> 273 K by definition b) STP pressure is 1 atm by definition c) Molar Mass of NO2 --> MW = 14+ 16*2 = 46 g/mol d) D of NO2 by STP D = MW*P/(RT) = (46)(1)/(0.082*273) = 2.054 g/L e) convert 20°C to K --> 20+273 = 293 K f) D at 20°C D = MW*P/(RT) = (46)(1)/(0.082*293) = 1.914 g/L

ID: 523766 • Letter: F

Question

Find the density (in g/L) of NO_2 (g) and the number of molecules per liter (a) at STP and b) at room conditions (20 degree C and 1.00 atm). In a study of O_2 uptake by muscle at high altitude, a physiologist prepares an atmosphere consisting of 79 mole % N_2, 17 mole % ^16O_2. And 4.0 mole % ^18O_2. (The isotope ^18O will be measured to determine the O_2 uptake.) The pressure of the mixture is 0.75 atm to simulate high altitude. Calculate the mole fraction and partial pressure of N_2 and ^18O_2 in the mixture. Determine what gases move the fastest.

Explanation / Answer

Abs T at STP --> 273 K by definition

STP pressure is 1 atm by definition

Molar Mass of NO2 --> MW = 14+ 16*2 = 46 g/mol

D of NO2 by STP

D = MW*P/(RT) = (46)(1)/(0.082*273) = 2.054 g/L

convert 20°C to K --> 20+273 = 293 K

D at 20°C

D = MW*P/(RT) = (46)(1)/(0.082*293) = 1.914 g/L

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Find the density (in g/L) of NO_2 (g) and the number of molecules per liter (a)

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