Under certain conditions, neon (Ne) gas diffuses at a rate of 7.0 centimeters per second. Under the same conditions, an unknown gas diffuses at a rate of 4.9 centimeters per second. What is the approximate molar mass of the unknown gas?

Question

aaronq · Answer

Do you know Graham's Law of diffusion?

anonymous · Answer

That I do not know..

aaronq · Answer

it this:$$\frac{ Rate _{1} }{ Rate _{2} }=\sqrt{\frac{ M _{2} }{M _{1} }}$$
M=molar mass
and it works because the rate of diffusion is proportional to the mass of the molecules.

anonymous · Answer

Okay lemme try

aaronq · Answer

aight

anonymous · Answer

41.2 g/mol is what I got

aaronq · Answer

it's good, now look at the periodic table for a gas that would of similar molar mass

anonymous · Answer

I'm feeling a dose of Molybdenum

aaronq · Answer

no :P  molybdenum is like 95 g/mol

anonymous · Answer

Aight so calcium is the next best thing

anonymous · Answer

It's the closest match I could find

aaronq · Answer

yeah, i guess that would be the closest thing. I just re-read the question and i thought you had to identify the gas lol but you don't.

anonymous · Answer

Alright so I have a question that I already answered but I want to make sure it's correct

anonymous · Answer

If 2.0 liters of oxygen gas react with excess carbon monoxide at STP, how many liters of carbon dioxide can be produced under the same conditions?

anonymous · Answer

It's multiple choice and the answer I got was 4.0L

aaronq · Answer

yeah, thats right.

anonymous · Answer

Worddd thank you

aaronq · Answer

no probs !