Kinetics
Solutions
Equilibrium
Solutions continued
Kinetics Continued
100
E
100
What is the osmotic pressure at 30 °C of a solution
of 1.68 M NaI?
83.5 atm
100
Given the following reaction, determine Kc
2HBr(g) → H2(g) + Br2(g)
Kc= [Br2] [H2]/ [HBr]2
100
A 0.500 L sample of an aqueous solution containing 10.0 g of hemoglobin has an osmotic pressure of 5.9 torr at 22 °C. Assuming ideal solution behavior, what is the molar mass of hemoglobin?
6.2*104g/mol
100
If the rate of concentration change for F2 is –0.281 M/s, what is the rate of concentration change for chlorine trifluoride, ClF3?
Cl2 (g) + 3 F2 (g) → 2 ClF3 (g)
0.187M/sec.
200
Given the reaction mechanism below
H2O2 + I- → H2O + IO- (slow)
H2O2 + IO- → H2O + O2 + I- (fast)
Identify the reactants, products, intermediates, and catalyst of the reaction
Reactants: H2O2
Products: H2O, O2
Intermediates: IO-
Catalyst: I-
200
Rank the following in terms of increasing boiling point
1.0m C2H6, 1.0m NaBr, .5m C4H10, 1m CaBr2
lowest: C4H10 , C2H6 , NaBr, CaBr2
200
2HBr(g) → H2(g) + Br2(g) Kc = 5.8x10-18
If you begin with a container of pure HBr, after it comes to equilibrium would you expect to find mostly HBr in the container, mostly H2 and Br2, or similar amounts of all three?
Mostly HBr
200
Which of the following aqueous solutions has the highest boiling point (Assume 100% dissociation for all soluble ionic compounds)?
A. 0.1 m Al(NO3)3
B. 0.2 m NaCl
C. 0.3 m Na2SO4
D. 0.4 m glucose (C6H12O6)
C
200
A first order reaction has a rate constant of 0.335 min-1. If the initial concentration of reactant is 1.00 M, how long must the reaction be run to reach a final concentration of 0.23 M?
4.39 Minutes
300
Given the reaction mechanism below
H2O2 + I- → H2O + IO- (slow)
H2O2 + IO- → H2O + O2 + I- (fast)
What is the proposed mechanism for the elementary steps above.
r = k [H2O2] [ I-]
300
Henry's law constant for CO2 is 3.4 × 10−2 M/atm at 25 °C. Assuming ideal solution behavior, what pressure of carbon dioxide is needed to maintain a CO2 concentration of 0.10 M in a can of lemon-lime soda?
In another can of soda, the pressure of carbon dioxide above the solution is 3.6 atm, what is the concentration of carbon dioxide in that solution?
A. 2.94 atm
B. [CO2]= 0.1224M
300
For the following problems determine the new value of Kc of this reaction: 3NO → N2O + NO2. Kc= 24.48
(a) 6NO(g) → 2 N2O(g) + 2 NO2(g)
(b) 3/2NO(g) → 1/2 N2O 1/2NO2
(c) NO2 + N2O → 3NO
a. Kc=599.27
b. Kc= 4.95
c. Kc = 0.041
300
0.75 moles of sodium chloride is dissolved in 225 g water. What is the change and new boiling point of the solution compared to water? For water Kb = 0.512 °C/m and Kf = 1.86 °C/m. Assume ideal behavior for the solute.
Change is 3.4°C
Boiling point of solution is 103.4°C
300
Given the following initial reaction data, determine
the reaction orders for each reactant.
NH4+ (aq) + NO2- (aq) → N2 (g) + 2H2O (l)
Rate = k[NH4+][NO2-]
400
What is the order of a reaction with these plots?
1st order
400
Calculate the molarity of a solution of Na2SO4 (142.0 g/mol), 20.0% by mass, given the density of solution is 1.10 g/mL.
1.55 mol/L