+- Introduction to Units of Concentration The composition of a solution can be e

Question

+- Introduction to Units of Concentration The composition of a solution can be expressed in several different ways. Four of the most common concentration units are defined as follows:. mass of component mass % = x 100% total mass of solution mole fraction (X) =moles of component/ total moles of solution molarity (M)=moles of solute/ liters of solution molality (m) =moles of solute/ mass of solvent (kg) A solution was prepared by dissolving 26.0g of KC1 in 225 g of water. Part A Calculate the mass percent of KC1 in the solution. Express your answer with the appropriate units. 10.4 % Part B Calculate the mole fraction of the ionic species KC1 in the solution. Express the concentration numerically as a mole fraction in decimal form.

Explanation / Answer

olecular weight KCl = 74.55 g/mol
26.0 / 74.55 = 0.348 moles KCl
Molecular weight H2O = 18 g/mol
225 / 18 = 12.5 moles H2O
X (KCl) = 0.348 / 0.348 + 12.5 = 0.0271

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