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What volume of hydrogen at STP is produced by dissolving 13.49 g of aluminum in excess sulfuric acid? Here's what I have so far, 2(Al) + 3(H2SO4) --> Al2 (SO4)3 + 3(H2) And A gas chamber has a leak where a known quantity of Ar leaks out in 60 hours. How long would it take to leak out the...