Diffusion, isn't this the formula I'm supposed to be using?

[rocomath]

A sample of an unknown gas takes 434 s to diffuse through a porous plug at a given temperature. At the same temperature, N2(g) takes 175 s to diffuse through the same plug. What is the molar mass of the unknown gas?

$$\frac {Rate_{A}}{Rate_{B}} = \sqrt {\frac {\mathcal{M}_{B}}{\mathcal{M}_{A}}}$$

 

[eli64]

faster vs slower gas

which one is the faster gas? would the faster gas be the lighter or heavier gas?

try your equn this way

faster gas = sqrt (Mslower/Mfaster)
slower gas

 

[ace123]

Yes the formula is correct but how are you using it? That is show what your getting

 

[rocomath]

Yes the formula is correct but how are you using it? That is show what your getting

thanks, the answer doesn't even appear as one of the choices.

 

[eli64]

what did you get as an answer?

 

[rocomath]

what did you get as an answer?

i appreciate your help but i was really only concerned about the equation, thanks.