Posted by **Bryan** on Sunday, April 29, 2012 at 3:36pm.

1.)A sample of oxygen took 55 seconds to travel a certain distance. How long would it take for the same number of moles of nitrogen to travel the same distance.

2.) A sample of hydrogen gas traveled 45m in a given amount of time. An unknown gas traveled 7.6m in the same amount of time. What is the formula mass of the unknown gas?

- Science-Chemistry -
**DrBob222**, Sunday, April 29, 2012 at 5:10pm
1.

The amount of sample is not given so let's make up one; say 1 l is convenient.

rate O2 = 1L/55 sec

rate N2 - 1L/x sec

(1/55)/(1/x) = sqrt (M2/M1)

M2 = molar mass N2

M1 - molar mass O2.

- Science-Chemistry -
**bryan**, Sunday, April 29, 2012 at 7:06pm
and do i do the same thing for number 2?

- Science-Chemistry -
**DrBob222**, Sunday, April 29, 2012 at 7:48pm
yes. The difference is that you have both rates given and are solving for molar mass of one of the gases.

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