11 Responses

1. Anonymous

   16|Oct|2007 1

   is the answer C, nitrogen?

   Reply

2. LinwooD

   16|Oct|2007 2

   nitrogen..

   Reply

3. illuminate-x

   16|Oct|2007 3

   I think it should be C – nitrogen gas is produced on a large scale for the production of ammonia (the Haber process).

   Reply

4. Anonymous

   17|Oct|2007 4

   Yup, nitrogen.
   Nitrogen is obtained by liquefaction of air and then fractional distillation.

   Reply

5. lijun(:

   17|Oct|2007 5

   nitrogen.
   there’s 98% of N2 in the air.

   Reply

6. Anonymous

   17|Oct|2007 6

   i think it’s methane, since it has the smallest molecular mass.

   Reply

7. pf

   18|Oct|2007 7

   i think is C) nitrogen
   as nitrogen makes up 78% of the composition of air.

   am i right?

   Reply

8. Spirit-Breaker

   18|Oct|2007 8

   A: Chlorine. I think is it because of the higher molecular mass?

   Reply

9. Sean Chua

   19|Oct|2007 9

   Dear Students,

   Good to see you thinking and participating.

   Answer for this question is C) Nitrogen Gas.

   N2 is makes up the majority of the air that we breathe and they are indeed liquefied and separated by fractional distillation.

   Two things i would need to clarify thou:

   1) N2 makes up 78-79% of the air that surrounds us, nothing less and nothing more
   2)For fractional distillation of air, the components are separated based on their boiling point and not their molecular mass. When we compare molecular mass in order to find the answer, the substances must be from same “homologous series”.

   Hope this helps.

   Sean
   SimpleChemConcepts
   “Learning Experience with A Difference”

   Reply

10. lijun(:

    21|Oct|2007 10

    omg. i put 98%. i must be mad.

    Reply

11. Anonymous

    23|Oct|2007 11

    It is nitrogen because nitrogen made up 79% of the gas in our atmosphere ^^

    Reply