# What is the density of Freon-11 (CFCl3) at 144°C and 3.0 atm?

It’s an easy question if you know the equation my teacher always likes to say. It’s still memorable, and even two years after I first heard it said, I still remember it. Stay like that :

Sweet ᴘᴇᴇ under dirt.

The equation is this:

M = dt/p

M = molecular mass of the substance
d = gas density
r = gas constant (atm = 0.08206)
t = Temperature in K

We have just discovered that the molecular mass of Freon-11 is:

C=12
F=19
Cl = 35.5

12+19+(3*35.5) = 137.5 = M (in the equation)

R = 0.08206
T = 417.15 K (to convert to kelvin just add 273.15 to Celsius)
P = 3 atmospheres
d = ?

Just plug it all in…

137.5 = (d*0.08206*417.15)/3
d = 12.05

I hope this helps you!

Source(s): I, AP Chemistry graduate, 2006
Dr. David Quam, AP Chemistry Professor
Chemistry-Zumdahl,Zumdahl

RE:
What is the density of Freon-11 (CFCl3) at 144°C and 3.0 atm?

Freon 11

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