شرج منهج كيمياء 1 (103) لطلاب كليات الهندسة جامعة طيبة شابتر 2 الجزء الثاني
للتواصل علي رقم الواتس 0556402306
Concentration Units of Solution The concentration of a solution is the amount of solute present in a given quantity of solvent or solution
1- Mass Percent
2- Mole Fraction (X)
Mole fraction of solute (X A )
Mole fraction of solvent (X B ) =
3- Molarity (M)
4- Molality (m)
Example The density of 2.45 M aqueous solution (1 L) of methanol (CH 3 OH)) (molar mass = 32.04 g) is 0.976 g/mL. What is the molality of the solution
Molality = 2.45 / 0.8975 = 2.73 m
Example What is the molality of a 5.86 M ethanol (C 2 H 5 OH) (molar mass = 46) solution (1L) whose density is 0.927 g/mL?
Molality = 5.86 / 0.65744 = 8.91 m
Example Calculate the molality of 35.4 (mass %) aqueous solution of phosphoric acid (H 3 PO 4 ) (molar mass = 97.99 g) Assuming that the mass of solution (phosphoric acid and water) = 100 g
Molality = 0.36 / 0.0646 (kg) = 5.57 m
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12 окт 2024
