June 21, 2021, 03:41:16 AM
Forum Rules: Read This Before Posting


Topic: Flemish chemistry olympiad question  (Read 503 times)

0 Members and 1 Guest are viewing this topic.

Offline yuheng_wu

  • Regular Member
  • ***
  • Posts: 20
  • Mole Snacks: +0/-0
Flemish chemistry olympiad question
« on: December 17, 2020, 02:45:23 AM »
Given
- incomplete combustion of atom X gives the following:
- X + O2  :rarrow: 1,5 . 10-2 mols CO2 + 4,5 . 10-2 mols CO + 4,5 . 10-2 mols H2O

Question: which atom is x?
a/ C2H2
b/ C4H6
c/ C4H8
d/ C4H10

The answer is b, but how do you solve this question? How do you know/calculate which atom X is?


Offline AWK

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7984
  • Mole Snacks: +555/-93
  • Gender: Male
Re: Flemish chemistry olympiad question
« Reply #1 on: December 17, 2020, 02:50:35 AM »
Hydrocarbon X !
Count moles of atoms C and H and find ratio
AWK

Offline yuheng_wu

  • Regular Member
  • ***
  • Posts: 20
  • Mole Snacks: +0/-0
Re: Flemish chemistry olympiad question
« Reply #2 on: December 17, 2020, 03:01:52 AM »
Hydrocarbon X !
Count moles of atoms C and H and find ratio
I understand now, thanks a lot!

Offline yuheng_wu

  • Regular Member
  • ***
  • Posts: 20
  • Mole Snacks: +0/-0
Re: Flemish chemistry olympiad question
« Reply #3 on: December 17, 2020, 03:06:49 AM »
Hydrocarbon X !
Count moles of atoms C and H and find ratio
And if it were a complete combustion of the hydrocarbon X, do you have to count the amounts of O2 as well in that situation? Or when do you have to consider the ratio of O2 as well?

Offline AWK

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 7984
  • Mole Snacks: +555/-93
  • Gender: Male
Re: Flemish chemistry olympiad question
« Reply #4 on: December 17, 2020, 03:11:12 AM »
You are not asking for anything related to oxygen, that is, the amount of oxygen needed for this reaction.
AWK

Sponsored Links