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Quick question - help please.

http://www.edexcel.com/migrationdocuments/QP%20GCE%20Curriculum%202000/January%202009/6CH01_01_que_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
Reply 1
Avatar for EffKayy
EffKayy
OP
16
anyone??
Reply 2
Avatar for EffKayy
EffKayy
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16
??
Reply 3
Avatar for canI?
canI?
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
Reply 4
Avatar for NGC4676
NGC4676
1
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.
Reply 5
Avatar for EffKayy
EffKayy
OP
16
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

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