Posted by druva on Tuesday, May 5, 2009 at 9:24pm.
I assume this is for STP.
Write and balance the equation.
Mg + 2HCl ==> H2 + MgCl2
How many moles HCl did you use? M x L = moles.
Using the coefficients in the balanced equation, convert moles HCl to moles H2.
Now convert moles H2 to liters knowing that 1 mole H2 gas occupies 22.4 L at STP.
Post your work if you get stuck.
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