Homework Help: chemistry

Posted by Stephanie on Saturday, November 24, 2012 at 5:12pm.

Calculate the volume of gas you would expect to be evoleved if X mol of magnesium were reacted with an excess of HCl at standard conditions. Would the answer be X, 22.4X, or 22400X?

chemistry - DrBob222, Saturday, November 24, 2012 at 5:34pm
X what? 22.4X what? 22,400X what?
Mg + 2HCl ==> MgCl2 + H2

X mol Mg will produce X mol H2. 1 mol occupies 22.4L at STP; therefore, X mols will occupy 22.4X L at STP. So you could have two of the correct answers above if 22.4X is L and 22,400X is mL.

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