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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: stevemont7 on February 23, 2015, 04:11:54 PM

Title: Stoichiometry: Mole-mole problem
Post by: stevemont7 on February 23, 2015, 04:11:54 PM

Hi everybody, I have a question regarding this stoichiomentry practice problem:

Given the reaction:

2 Na + 2 H₂O  :rarrow: 2 NaOH + H₂

What is the total number of moles of hydrogen produced when 4 moles of sodium react completely?

I set up the proportion 4/2 = x/1 and got x = 2, making my answer 2 mol.

Here's my problem: should the hydrogen in the sodium hydroxide be included? In other words, is the question ambiguous by not specifying molecules of hydrogen or should you only include the element on its own?

Title: Re: Stoichiometry: Mole-mole problem
Post by: Borek on February 23, 2015, 04:49:46 PM

It asks specifically for hydrogen, not for "hydrogen in hydroxide or any other compound".