Homework Help: chem

Posted by Anon on Thursday, March 26, 2009 at 9:55pm.

When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. What volume of 1.0 M HCl is required to react completely with 4.00 g of magnesium

i did 4.00g x (mol/24.31 g Mg) x (2 mol HCl/1 mol Mg) x (L/!.0 mol HCl) = .329 L

why is this wrong?

chem - DrBob222, Thursday, March 26, 2009 at 10:12pm
It looks ok to me, too. Perhaps the answer should be in mL and not L. Check the problem and your typing. Make sure all of the numbers and units agree.
chem - bobpursley, Thursday, March 26, 2009 at 10:12pm
I dont see an error.
chem - DrBob222, Thursday, March 26, 2009 at 10:13pm
I just noticed that the molarity of the HCl is 1.0 M; therrefore, you have only two significant figures. Thus the answer should be reported as 0.329 = 0.33 L tp 2 s.f. That may be the problem.
chem - Anon, Thursday, March 26, 2009 at 10:25pm
thanks that worked

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