Q1: calculate the density of solute (10 ml benzene) in liquid mixture if the mole fraction of solvent ( 20 ml carbon tetrachloride and ) 0.342 and the density of solvent (1590 Kg/m³) at 30 °C ? Atwe(C=12,Cl=35.5,H=1) g/ mol

Chemistry & Chemical Reactivity
9th Edition
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter13: Solutions And Their Behavior
Section13.1: Units Of Concentration
Problem 1CYU: (a) If you dissolve 10.0 g (about one heaping teaspoonful) of sugar (sucrose, C12H22O11) in a cup of...
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Q1: calculate the density of solute (10 ml benzene) in liquid mixture if the mole fraction of solvent ( 20
ml carbon tetrachloride and ) 0.342 and the density of solvent (1590 Kg/m) at 30 °C ?
Atwt(C=12,Cl=35.5,H=1) g/ mol
Q2: When adding( 5 g) of salt to( 0.23 L) of hot water(40 °C) inside the calorimeter, the density of the
solution is 2.56 g / ml and the temperature of the solution decreased by( 5 K). Calculate the molecular
weight of the salt? Knowing that the calorimeter constant is 2.98 kJ / mol at 20° C, the heat of solubility
the solution is (123 J / mol) and ( specific heat of the salt ( 0.774 J/g.°C).
Q3 : When nitric acid is added to the water, the temperature of the solution increases, while adding
potassium chloride to the water, the temperature of the solution decreases. Why? What is the scientific
name for these two cases.
Q4: The excess molar volume of liquid mixtures in some solutions appears negative, while in others it
appears positive. Why?
Transcribed Image Text:Q1: calculate the density of solute (10 ml benzene) in liquid mixture if the mole fraction of solvent ( 20 ml carbon tetrachloride and ) 0.342 and the density of solvent (1590 Kg/m) at 30 °C ? Atwt(C=12,Cl=35.5,H=1) g/ mol Q2: When adding( 5 g) of salt to( 0.23 L) of hot water(40 °C) inside the calorimeter, the density of the solution is 2.56 g / ml and the temperature of the solution decreased by( 5 K). Calculate the molecular weight of the salt? Knowing that the calorimeter constant is 2.98 kJ / mol at 20° C, the heat of solubility the solution is (123 J / mol) and ( specific heat of the salt ( 0.774 J/g.°C). Q3 : When nitric acid is added to the water, the temperature of the solution increases, while adding potassium chloride to the water, the temperature of the solution decreases. Why? What is the scientific name for these two cases. Q4: The excess molar volume of liquid mixtures in some solutions appears negative, while in others it appears positive. Why?
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