[KungKemi]

Hello,
The title really says it all. I was just wondering if anyone could help me by sharing any difficult stoichiometry questions which you may know of. These questions can range from Redox, Solution, Equilibrium constant reactions, Gas-Law problems, Classical-Stoichiometry, Limiting-reagent, Percent purity, Unknown empirical/molecular formulae, Percent yield problems, etc. Questions which incorporate several of these "disciplines" into one question are ideal. This is merely for self-interest so there is no real deadline.

"University questions" which do not delve into organic chemistry yet cover said previously stated stoichiometry disciplines are of high interest.

Any help would be highly appreciated!

PS: I would prefer questions which are as "difficult" or (preferably) more difficult than the following question: http://www.chemicalforums.com/index.php?topic=70891.0

KungKemi

[AWK]

There are none hard stoichiometry question, there are only poor educated or non-experienced chemists. Try these attached redox reactions (mostly) taken from Journal of Chemical Education.
When you solve them all in less then 2 hours you can strike out the word hard

[KungKemi]

I couldn't agree more. Thank you for the chemical equations AWK. In complete honesty, I have never seen chemical equations which are quite as large as some of them, however, I will enjoy balancing them equally. Nevertheless, if anyone else or yourself, AWK, has knowledge of questions which may involve algebra and Stoich. together that would be very much desirable (practice makes perfect, I feel).

[AWK]

You have 2 beakers containing:
1. 50.0 ml 15.0 % Na2CO₃ d=1.1574 kg/L
2. 50.0 ml 9.00 % HCl d=1.0426 kg/L
Calculate volume of CO₂ at STP if it is produced when you slowly poured:
1. content of beaker 2 into beaker 1
2. content of beaker 1 into beaker 2
And finally calculate mass percent composition of both obtained solutions assuming all free CO₂ was removed.

[AWK]

Chek problems of the week (discontinued in 2013)

http://www.chemicalforums.com/index.php?board=67.0

[KungKemi]

Thank you AWK. Much appreciated.