DH a1 the solvent in a Movement of solvent molecules through a semipermeable mem
ID: 706417 • Letter: D
Question
DH a1 the solvent in a Movement of solvent molecules through a semipermeable membrane from a region of lower solute concentration to a region of higher solute concentration (e (d) The dependence or the reaction rate constant on thc temperature 3 (e) The number of reactant molecules (or ions, atoms, or free radicals) in an e and the activation energ ( The ratio of the experimentally observed value of the freezing point depression to the value calculated, assuming no dissociation (8) The solubility of a gas in a liquid is directly proportional to the gas pressure. H (h) The time required for the concentration of a reactant to decrease to one half its initial value (i) A change in any of the factors determining an equilibrium causes the system to adjust by shifting in the direction that reduces or counteracts the effect of the change (j) The slowest step that determines the rate of the overall reaction B. Choose only one correct answer for each of the following questions (4 pts each). B1. Which of the following three pairs of liquids is (are) immiscible? (A) H20 and CCl (B) CaHs (benzene) and CC (C) H20 and CHOH a) A b)B c) C d) All of the above e) None of the above B2. You dissolve 23.4 g of glucose (CaH20) in 952 g of water. What is the molality of this glucose solution? The molar mass of glucose is 180.16 g/mol. a) 0.0450 m b) 0.102m c) 0.136 d) 0.256 m )0.472m 33. An unopened soda can has an aqueous CO2 concentration of 0.0506 mol/kg at 25 C. The Henry's law constant for CO2 is 0.034 mol/kg bar. What is the pressure of CO2 gas in the can? c) 1.34 bar d) 1.49 bar )1.62 bar a) 0.736 bar ) 1.02 barExplanation / Answer
B1 )
A) H2O and CCl4 are immiscible
H2O is polar and CCl4 is nonpolar.since the polar dissolve the polar and nonpolar dissolve nonpolar.
B2)
molality = no of moles/mass of solvent in Kg
no of moles = weight / molar mass
molality = (23.4 / 180.16 ) / 0.952 = 0.136 m
B3)
C = K*P
where P is pressure ,K is henry constant and C is concentration
P = C / K = 0.0506 /0.034 = 1.49 bar
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