Question

1. Determine the change in the boiling point (ΔT_B) and Bp for a solution containing 0.328 moles of naphthalene (a nonvolatile, non-electrolyte compound) in 250. g of liquid benzene (Bp° = 80.1°C)? (K_b = 2.53˚ C/m)

3.32 °C and 76.8 °C

3.32 °C and 83.4 °C

4.31 °C and 0 °C

7.41 °C and 72.7 °C

7.41 °C and 87.5 °C

2.

Consider the following equilibrium reaction.

                             P₄S₃(g) + 8O₂(g) ⇌ P₄O₁₀(s) + 3SO₂(g) ΔH = –3677 kJ

If heat is removed from an equilibrium mixture of P₄S₃, P₄O₁₀, O₂, and SO₂, then

the system will shift toward reactants to re-achieve equilibrium.

K_eq will decrease.

more information is needed to determine the effect on the equilibrium.

the system will shift toward products to re-achieve equilibrium.

the system will remain at equilibrium with no change in concentrations.

3.

The Figure below represents an old “over the counter” bottle of heroin. It was first synthesized in 1874 by C. R. Alder Wright and later marketed by the Bayer company in 1895 as an aspirin replacement. They coined it the “hero” drug and for a brief time you could find it anywhere, even children’s cough syrup. It was pulled off the market quickly as it is highly addictive and deadly.

The drug is metabolized by the liver following first order kinetics. it has a half-life of 30 min. How long will it take for heroine

to decrease from 0.0700 M to 0.0100 M in your liver?

30 min

61 min

84 min

13 min

72 min

4.

For the reaction below, ΔH˚ = -196 kJ and ΔS˚ = -126 J/K at 25˚ C.

2H₂O(l) + O₂(g) ⟶ 2H₂O₂(l)        

Calculate ΔG˚ for the reaction in kilojoules.

-234 kJ

-193 kJ

-158 kJ

-37.7 kJ

-348 kJ

5.

What information can be obtained from the Figure below?

The equivalence point occurs at pH = 7.0 but the pK_a is not known from the graph.

Both the pOH and the pK_b cannot be calculated from the graph.

The equivalence point occurs at pOH = 10 and the pK_b = 6.0

The equivalence point occurs at pH = 8.0 and the pK_a = 4.0

Answer 1

1) 250.0 g benzene contain 8.328 mole of 18 benzene cmam 0.3288 naphthalene more of haphthalene 250.0 1000g benzene contin 0.328x2000 mole of nophinde naphthalene cm 1.312 m 250.0 Then relation between ATB and cm is 4TB = kb xem - 2.531.312 ATB - 3.32 °c The boiling a point of seintion is = (3.32+80.1) oc 83.482 = 83.4°C so the correct optimis 3.32 c and 83.4°C