Ideal gases - problem (important)

[IB-Adam]

What mass of carbon dioxide is required to fill a tank of volume 12.0 L at a temperature of 20.0 C degrees and a pressure of 4.00 atm?

The answer is 87.9g

First I have to get n (moles) and I have done that, but I dont know what to do next... noob help please ! Test tomorrow

Edited November 23, 2010 by IB-Adam

[dessskris]

use pV=nRT to find n (this is what you did right?)

then after you get n, you can find the mass by:

mass=n*Mr

the Mr of CO₂ is given by 12.01+2*16.00 (values can be found in the data booklet)

good luck!

[IB-Adam]

use pV=nRT to find n (this is what you did right?)

then after you get n, you can find the mass by:

mass=n*Mr

the Mr of CO₂ is given by 12.01+2*16.00 (values can be found in the data booklet)

good luck!

i get "n" to be : 0,02, which will not give me the right answer of your way of solving

Still in need of help !

Edited November 23, 2010 by IB-Adam

[ILM]

You missed up with the value of R. R=8.31 when you are dealing with pascal, but if you work with atm the R= 0.082.

PV=nRT

4*12=n(0.082)(293)

48=24.062n

n=2

Mass=n*Mr

=2*44.01

=88 approx.

[IB-Adam]

You missed up with the value of R. R=8.31 when you are dealing with pascal, but if you work with atm the R= 0.082.

PV=nRT

4*12=n(0.082)(293)

48=24.062n

n=2

Mass=n*Mr

=2*44.01

=88 approx.

Ow that's why, Thank you

Problem solved.

[dessskris]

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