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What is the molarity of a KF (aq) solution containing 116 grams of KF in 1.00 liter of solution?
A. 1.00 M
B. 2.00 M
C. 3.00 M
D. 4.00 M
Molarity
Step 1: find the moles of solute using the formula:
mass of solute (g) divided by formula mass of solute
Step 2: divide the moles of solute by volume of solution in liters M / V.
Or if you know the moles of solute,
Molarity = moles of solute divided by volume of solution in liters . KF has a formula mass of 39 + 19 or 58 g/mole. Since 116 grams are given, 116g / 58g/mole = 2 moles of solute.
To find the Molarity, take 2 moles of solute and divide by 1 L of solution.
2 moles / 1 L = 2.00 M solution
 
 
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JPlantesMD
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I wrote the MCAT about 8 years ago. During that time I created a whole lot of study material for myself and my friends. I want to now share it with the world. Good luck :)
 
 
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While these questions do not fit the MCAT format (they have no related reading passages) they cover concepts one should understand in order to do well in the physical sciences portion of the MCAT.
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Added: 7/2/2008
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Akers1869
Akers1869 says:
On the problem which asks, "Which conditions will increase the rate of chemical reaction," I noticed that the explanation is rather weak and misleading, to some degree. To be given a scenario concerning rate of reaction without disclosing the direction of entropy.... For instance, the answer stating that decreased temperature and increased concentration of reactants would stand true for an exothermic reaction. Endothermic reactions like heat whereas exothermic reactions like cooler temperatures. As such, the scenario would be read as , "Which conditions will increase the rate of an exo/endo-thermic chemical reaction?" An intelligent individual would agree, but a genius in search of truth would whole-heartedly know that it's all just part of our powerless scientific paradigm.... In this case we are speaking of our ever evolving health sciences paradigm that is in need of a serious overhaul. We, as the future of holders of medical technology, must demand that the hopes and dreams for any
Posted: 6/2/2011