The composition of a solution can be expressed in several different ways. Four o

Question

The composition of a solution can be expressed in several different ways. Four of the most common concentration units are defined as follows: mass% = mass of component/total mass of solution times 100% mole fraction (X) = moles of component/total mass of solution molarity (M) = moles of solute/liters of solution molality(m) = moles of solute/mass of solvent (kg) Calculate the mole fraction of the ionic species KCl in the solution. Express the concentration numerically as a mole fraction in decimal form. Calculate the molarity of KCl in the solution if the total volume of the solution is 239 mL. Express your answer with the appropriate units. Calculate the molality of KCl in the solution. Express your answer with the appropriate units.

Explanation / Answer

Part B: Molecular weight KCl = 74.55 g/mol
39.0 / 74.55 = 0.523 moles KCl
Molecular weight H2O = 18 g/mol
225 / 18 = 12.5 moles H2O
X (KCl) = 0.523 /(0.523 + 12.5) = 0.0401

Part C:
V = 0.239 L
M = 0.523 / 0.239 = 2.19

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