Kinetics and Equilibrium
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The solution discusses kinetics and equilibrium.
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Kinetics and equilibrium
1- An aqueous solution containing 18.9g of an unknown molecular (nonelectrolyte) compound in 103.0g of water was found to have a freezing point of -1.7 ∘ C.Calculate the molar mass of the unknown compound.Express your answer using two significant figures and g/mol
delta Tf=i*m*kf
1.70C=1*(18.9g/M)/(0.103kg)*1.860C/m
M=200.77 g/mol
2- What is the osmotic pressure of a solution made by dissolving 25.0g of glucose, C 6 H 12 O 6 , in enough water to form 325.0mL of solution at 34.0 ∘ C ?.
Osmotic pressure: i*M*R*T=1*25.0g/(180g/mol)/(0.325L)*0.08206L.atm/(K.mol)*(34+273)K=10.77 atm.
3- A solution of water (K f =1.86 ∘ C/m ) and glucose freezes at − 2.75 ∘ C . What is the molal concentration of glucose in this solution? Assume that the freezing point of pure water is 0.00 ∘ C Express your answer to three significant figures and include the appropriate units.
Delta Tf=i*m*kf
2.750C=1*m*1.860C/m
Molality: m=1.48 m.
4- A solution of water (K b =0.512 ∘ C/m ) and glucose boils at 102.06 ∘ C . What is the molal concentration of glucose in this solution? Assume that the boiling point of pure water is 100.00 ∘ C .Express your answer to three significant figures and include the appropriate units.
Delta ...
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