Quick question - help please. Watch

EffKayy
Badges: 2
Rep:
?
#1
Report Thread starter 7 years ago
#1
http://www.edexcel.com/migrationdocu...e_20090109.pdf

I can't get my head around question 11. (MPQ)

The answer is B but I can't figure out why.

Please help.

Thanks
0
reply
EffKayy
Badges: 2
Rep:
?
#2
Report Thread starter 7 years ago
#2
anyone??
0
reply
EffKayy
Badges: 2
Rep:
?
#3
Report Thread starter 7 years ago
#3
??
0
reply
canI?
Badges: 0
Rep:
?
#4
Report 7 years ago
#4
well , yhea to be honest when I tried that one couldent get it right at first but then I was like mmmmmmmmmmm
it's to do with mole ratio stuffs ,
notice the water gas and all of them under the same conditions i.e pressure and temp SO 2mol of hydrogen gives 2mol water ___ 1:1 ratio
1mol of oxygen gives 2mol water GAS _____ 1:2
so 50 of H2 gives 50 of H2O
25 of O2 gives 50 of H2O

HOPE YOU KNOW WHAT I MEEN
0
reply
NGC4676
Badges: 1
Rep:
?
#5
Report 7 years ago
#5
The equation means that 2 hydrogen will react with one oxygen to pruduce 2 water molecules. Under the same conditon, same amount of particles occupy the same volume. So just imagine it's 50 hydrogen molecules and 25 oxygen molecules, they will produce 50 water molecules,(ratio is 2:1:2), so the answer is B, 50cm3.
0
reply
EffKayy
Badges: 2
Rep:
?
#6
Report Thread starter 7 years ago
#6
(Original post by NGC4676)
The equation means that 2 hydrogen will react with one oxygen to pruduce 2 water molecules. Under the same conditon, same amount of particles occupy the same volume. So just imagine it's 50 hydrogen molecules and 25 oxygen molecules, they will produce 50 water molecules,(ratio is 2:1:2), so the answer is B, 50cm3.
Cheers
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

University open days

  • Cranfield University
    Cranfield Forensic MSc Programme Open Day Postgraduate
    Thu, 25 Apr '19
  • University of the Arts London
    Open day: MA Footwear and MA Fashion Artefact Postgraduate
    Thu, 25 Apr '19
  • Cardiff Metropolitan University
    Undergraduate Open Day - Llandaff Campus Undergraduate
    Sat, 27 Apr '19

Have you registered to vote?

Yes! (371)
37.29%
No - but I will (75)
7.54%
No - I don't want to (70)
7.04%
No - I can't vote (<18, not in UK, etc) (479)
48.14%

Watched Threads

View All
Latest
My Feed