May 2011 SAT CHEM

<p>What must your raw score be to get a 700?</p>

<p>isnt 32 grams of O2 1 mol of O2?</p>

<p>^ Yeah, but O2 is diatomic so there would be twice as many moles of O, so 2 times 6.02x10^23rd atoms.</p>

<p>I agree with SccrScrub01. I put 32 grams of O2 is 1 mol. </p>

<p>Both 22.4 L of H2 and He at STP could have been easily crossed out. They both have the same values of T, P, and V. Therefore, you could assume that they both have the same number of mols by using the PV=nRT equation. That just wouldn’t make sense.</p>

<p>However, 1 mol of O2 is 32 grams of O2. Thus, that has to be the most correct answer.</p>

<p>I put the 32g of O2…why is it wrong?</p>

<p>I thought there were multiple right answers lol :P</p>

<p>@ Keetz… the main difference (and the difference between right and wrong) between He and h2 is that H2 has two atoms where He as one. 1 mol H2 = 2 mol atoms…1 mol He = 1 mol atoms…</p>

<p>I thought it was that H2 and O2 meant the same thing, because you would have to multiple Avogadro’s number by 2 and thus would be wrong.
Did the question as for molecules (i.e. O2 and H2 would count as one) or individual atoms/particles? (i.e. O2 and H2 would count as two)</p>

<p>i thought that question asked for which quantities are equivalent to 1 mol. i put O2 and He. i’m fairly sure those are right. 22.4 L of He = 1 mole He at STP and 32 g O2 = 1 mol O2. or was the question asking something different? ohh :(</p>

<p>molecules :o</p>

<p>it asked for mole of ATOMS. I’m 100% sure on this</p>

<p>ohhhh…well then. :frowning: what’s the greatest number of questions you can miss and still get a 760+ ?</p>

<p>Wait… I thought the question was asking which of the following was 1 mol?</p>

<p>somethingbetter . . . how did you put both He AND O2?</p>

<p>We have to assume they wrote molecules, because if they didn’t specify the He, H2, and O2 would all be correct, right?</p>

<p>wait am i thinking about a different question? or mixing up two questions? is this the one with roman numerals? like which one of these works…I/II/III. or combinations of thoseee</p>

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</p>

<p>No, I’m 100% sure they wrote atoms.</p>

<p>@somethingbetter: it’s not one of the I/II/III ones.</p>

<p>the question specifically asked for 1 mole of atoms. All were 1 mole of molecules except He. Only He was one mole of atoms. The rest had 2, 2, 4, and something(wasn’t 1 though) atoms altogether so it wasn’t one mole.</p>

<p>i remember a question in that format…and it had something about 1 mole and it had I. something II. something III. avogadro’s number…something like that? or am i imagining this?</p>

<p>well then ignore what i said before. i don’t remember the question you guys are talking about. sorry about the confusion :(</p>

<p>yeah. I put ionization and oxidation state only. mass number didn’t make sense</p>