<p>"2.00 grams of zinc were added to 35.0 mL of 1.0 M HCl. H2 gas was produced and collected in a 250.0 mL container @ 25 degrees C. What is the pressure of H2 gas in the container?"</p>
<p>i believe the equation would be:
Zn + 2HCl -----> H2 + ZnCl2</p>
<p>I got 1.8 atm. Does anyone else concur?</p>
<p>I got 1.71 atm to be exact. 3 significant figures ^_^</p>
<p>I ended up with 1.7 X 10^2 KPa, or 1.7atm</p>
<p>Edit: van1011, wouldn't it be 2 significant figures, because of the 1.0M?</p>
<p>doesnt the 1.0 M make it 2 sig figs or doesnt this matter?...lol</p>
<p>ohhh yeah... I didn't pay attention to the molarity. My bad my bad ^_^</p>
<p>lol okay..thanks</p>
<p>WOuldn't the Zn and Cl2 be written seperately as iions because they're soluble. Unless Zn is exception, which I forgot.</p>
<p>I took chem last year and I tots forgot how to find the pressure. ANyone care to clue me in?</p>
<p>For ideal gases, there's the {PV=nRT} formula. P is Pressure, V is volume, n is mols, R is the universal gas constant and T is temperature in Kelvins.</p>
<p>ZnCl2 is soluble in water, if I remember my solubility table correctly (aren't all halogen compounds soluble?) I don't think it really matters which way you write it; it would balance out the same. I usually group them together as a compound, then write (aq) sub-scripted.</p>
<p>lol im not sure about the ions...as far as pressure, PV=nRT.
as far as sig figs go...1.8 atm or 1.7 atm (should sig figs be used at each step?)</p>
<p>Sweet deal. DOn't worry. Everone forgets 1/2 the unimportant crap of science anywyas. Just remember the basics and you're fine.</p>
<p>ziggytheman, don't round your numbers to fit the sig digs until the very end.</p>
<p>okay...will do....thanks!</p>
<p>it's basically my fault for having to do this hw anyway, after making a comment about the hw board, which read today: "AP Chem: no homework ever. (and it shows)"</p>
<p>you can have 1% error in ur answers, dont worry</p>