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Topic: Seems simple, but somehow confusing? What?  (Read 2041 times)

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Offline Zoloft

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Seems simple, but somehow confusing? What?
« on: February 09, 2009, 12:30:48 AM »
Hi everyone, I have this problem that I'm somewhat confused about. The problem is:

"An alloy of aluminum and magensium was treated with sodium hydroxide solution, in which only aluminum reacts to give hydrogen gas:

2Al + 2NaOH + 6H20 --> 2NaAl(OH)4 + 3H2

If a sample of alloy weighing 1.118 g gave 0.1068 g of hydrogen, what is the percentage aluminum in the alloy?"

How do I account for the magnesium and what stoichiometric relationships would I need to set-up? This is very confusing, but I appreciate the slightest of help on this!

Thank you.

Offline Borek

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Re: Seems simple, but somehow confusing? What?
« Reply #1 on: February 09, 2009, 03:00:23 AM »
Magnesium is whatever solid will be left after the reaction, so if you know mass of the sample and mass of dissolved Al...
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