I realize we are supposed to attempt our homework questions prior to posting them here, but I just had no idea where to start with this one:
Consider a sealed box containing 1.00mol He(g) @ STP. This box is to be located in Earth's orbit in outer space (surrounded by essentially total vacuum). The temperature inside the box is maintained @ STP. Your mission is to drill a hole in one wall of this box such that the He(g) effuses through the hole at an initial rate of 1.00x10^15 molecules per microsecond (10^-6 seconds). What diameter hold will you drill?
I realize we're dealing with Graham's law...that's about as far as I got before the panic of this question set in.
Any help would be grand, even a little push in the right direction.
Cheers,
Michelle