Question 30

[Guest]

I understand the explaination that was given. But I had a different perspective on solving this problem. Mine is a bit messy....sorry
Since it is an exothermic rxn, if temperature was raised then rxn would shift to the left. That means the concentration of the carbon dioxide would decrease which will decrease Pressure. If you decrease pressure than M increases (M=wRT/PV). Would this be okay??

[admin]

Your logic seems reasonable except for one important point that often comes up on the MCAT: comparison. Comparing 2 different experiments or conditions comes up relatively often on the new MCAT.

So the difficulty with your reasoning is that you need to be able to compare 2 different exothermic reactions. It so happens that your logic worked out (there was a 50-50 chance). But this problem is not so important, what is important for you doing well on the MCAT is to take an equation that they give to you (or that you knew) and be comfortable to manipulate that equation in ways that they want. Of course using logic may work (don't forget, you will be nervous and possibly tired at some point) but using objective equations and manipulating them after practicing is the safest why to get a high score.