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michele12 michele12
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11 years ago
What is the molarity of a solution that contains 0.40 moles of KBr in 0.5 liters of solution?

My teacher gave us the conversions but didn't give us examples to work on so I don't understand it.
Any help is appreciated. Thanks in advance.
Under "L of solution," she wrote "concentration or molarity: # mol - solute/1 L - solution"

What does that mean? =/
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#1
11 years ago
molarity is the number of moles of a substance divided by the total liters of solution.
.4 moles of KBr divided by .5L = .8M solution
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#2
11 years ago
Moles/liters = molarity!

divide 0.4/0.5

when asking for molarity always use moles over liters~!
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#3
11 years ago
Molarity: It is the no. of solute molecules present in a unit volume of solution.

Here it is.
0.4 moles of solute in 0.5 lit. of solution or
0.8 moles of solute in 1.0 lit. of solution (simply, multiply d abv eqn. to make the vol. of soln. unity)

So, 0.8M.
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