SOLUTION: hello again...long time i havent needed help from you but the last time u helped a lot...now i was wondering i have this hard chemistry question due tomorrow and i was wondering if

Algebra ->  Algebra  -> Expressions-with-variables -> SOLUTION: hello again...long time i havent needed help from you but the last time u helped a lot...now i was wondering i have this hard chemistry question due tomorrow and i was wondering if      Log On

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Question 31204: hello again...long time i havent needed help from you but the last time u helped a lot...now i was wondering i have this hard chemistry question due tomorrow and i was wondering if by any chance you could answer it...im having a really hard time on it...if u have an answer will you please send it to me as soon as possible because its due tomorrow in the morning...thanks for your help and for taking the time to read it
this is the problem:
2 H2O--> 2 H2+o2
there are two moles of hydtrogen in the first side of the equation
the question is how many moles of hydrogen gas are in the second side of the equation...i know the answer is two for sure (my teacher told me) but i dont know why or how
sincerely
stephanie a.
Answer by longjonsilver(2297) About Me  (Show Source):
You can put this solution on YOUR website!
from memory, what you have here is:
2 moles of water --> 2 moles of hydrogen + 1 mole of Oxygen

As you have no masses, we cannot use the formula +moles+=+%28mass%29%2F%28molecular+mass%29+

So i think it is purely down to the numbers:

2H20 --> 4H and 2O
2H2 --> 4H
O2 --> 2O

all the hydrogen in the water has gone to the hydrogen gas, so if we startetd with 2 moles of hydrogen, we had to finish with 2 moles of hydrogen. I think, from memory and common sense :-)

jon.