Posted by swtnblk on Sunday, November 6, 2011 at 9:00pm.
You know a mole of a gas at STP occupies 22.4 L.
moles H2 produced = 28.5L/22.4 L/mol = ??
Use the coefficients in the balanced equation to convert moles H2 to moles HCl.
Then MHCl = moles HCl/L HCl. You have M HCl and moles HCl, solve for L and convert to mL.
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