Question

Determine the molarity of a solution formed by dissolving 4.00 moles of KBr in enough water to yield 3.00 L of solution.

Answer 1

Molarity (M) is the numer of moles per liter (mol/L)

Both are already given:
mol = 4.00 moles of KBr
L = 3.00 L H2O (water)

Plug them both into the equation:
4.00 mol KBr  = 1.33 M KBr (1.33 because of sig figs)
3.00 L H2O 

Answer 2

The the molarity of the KBr solution is 1.33 M

The molarity of a solution is defined as the mole of the solute per unit litre of solution i.e

Molarity = mole / Volume

With the above formula, we can obtain the molarity of the KBr solution as follow:

Mole of KBr = 4 moles

Volume = 3 L

Molarity of KBr =?

Molarity = mole / Volume

Molarity = 4/3

Molarity of KBr = 1.33 M

Therefore, the molarity of the KBr solution is 1.33 M

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