<p>hey i got another question but i cant remember it all.</p>
<p>The question asked whats the maximum number of moles of the product.</p>
<p>The balanced equation looks like this - 3… + O2 → 2… ( i cant remember the other 2)</p>
<p>The first molecule yield 6 moles ,O2 yields 4 moles, but O2 is limiting agent so the maximum number of moles of the product is 8?</p>
<p>If there are 6 moles of the first molecule and 8 moles of O2, then the limiting reactant is the first molecule.</p>
<p>This is because you’re using the first molecule in a greater quantity and you have less of it. So the answer should be 4 moles of the product. </p>
<p>@Dragonoh</p>
<p>I don’t recall what I put as the answer, but I eliminated all the answers with I and III in them. I figured that since the temperature doesn’t change while melting, then a thermometer is useless. Barometer measures the pressure and I don’t think it has much to do with heat of fusion–I’m not sure, but I believe this is a reasonable elimination. I think in the end, the only answer left was (a) (II) Calorimeter.</p>
<p>RandomD: Oh…darn I used the Q=mC(change in temp.) for my reasoning …darn it</p>
<p>Isnt it 4 moles of o2? I dun think its 8 :s</p>
<p>You can’t tell which one is the limiting by looking at coefficients…you have to find the ratio by doing a stoichiometry dimensional analysis</p>
<p>Oh, my bad. If it is 4 moles of O2, I’m still pretty sure the first one becomes the limiting reactant anyway.</p>
<p>First Molecule (let’s call this A) has 6 moles.
There are 4 moles of O2.</p>
<p>In the reaction, you use 3 moles of A for each mole you use of O2.
Thus, by the time you use 6 moles of A, you’ll have used 2 moles of O2 only. There will be 2 moles of O2 that you did not use. This means that you had an excess of oxygen and oxygen is thus not the limiting reactant.</p>