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Unformatted text preview: Lesson 4 1 Lesson 4 Chemical Reactions in Solution Lesson 4 Solutions are composed of a solvent and one or more solutes Solvent : present in the largest amount Solute : present in smaller amount than the solvent Solutions are homogeneous, i.e. have uniform properties Lesson 4 Lesson 4 Composition of solutions Mole fraction Molality Molarity ( depends on T ) n j j i n i i n n n n n n x 1 2 1 ... 1 1 n j j x solvent of kg solute of moles molality solution of litres solute of moles molarity Percentage 25% (v/v): 25 mL solute per 100 mL solution 25% (w/v): 25 g solute per 100 mL solution 25% (w/w): 25 g solute per 100 g solution Lesson 4 Example 1 Aqueous solutions of sodium hypochlorite (NaClO) can be used in the synthesis of hydrazine (N 2 H 4 ). Hydrazine has often been used as a rocket fuel for engines in the orbital maneuvering system of the space shuttle....
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