Q: The Henry's Law constant for CO in water at 25°C is $$9.71 \times 10$$^{-4}$$\ \mathrm{mol/(L\cdot atm)}. $$How many grams of CO ($$M = 28.01\ \mathrm{g/mol}) $$will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm?

$$7.48 \times 10$$^{-2}$$\ \mathrm{g}$$

Question 1

Octane has a vapor pressure of 40.0 torr at 45.1°C and 400. torr at 104°C. Using the Clausius-Clapeyron equation, what is the heat of vaporization ($$\Delta H_{vap}) $$for octane?

Accepted Answer

$$39.0\ \mathrm{kJ/mol}$$

Question 2

Refer to the phase diagram for a substance. As one moves from point A (solid) to point B (liquid) by increasing temperature at constant pressure, which process is occurring?

Accepted Answer

Increasing temperature with a phase change from solid to liquid.

Question 3

Which of the following statements is true about a phase diagram where the solid region is denser than the liquid region?

Accepted Answer

The solid is denser than the liquid.

Question 4

The molecule shown in the first image is octane. What is the dominant intermolecular force present in octane?

Accepted Answer

Dispersion forces.

Question 5

In hydrogen iodide (HI), which intermolecular force is most significant?

Accepted Answer

Dipole-dipole forces.

Question 6

Which of the following atoms has the greatest polarizability?

Accepted Answer

Pb

Question 7

Which of the following pairs of molecules can form hydrogen bonds between them?

Accepted Answer

CH$$_3OH $$and NH$$_3$$

Question 8

Which of the following compounds would have the highest surface tension at a given temperature?

Accepted Answer

CI$$_4$$

Question 9

Polonium crystallizes in a simple cubic lattice. What is the coordination number for Po in this structure?

Accepted Answer

6

Question 10

Which of the following would be considered an ionic salt?

Accepted Answer

FeSO$$_4 at $$room temperature

Question 11

Given $$\Delta H_{soln} = \Delta H_{solute} + \Delta H_{solvent} + \Delta H_{mix}$$, which set of signs is correct for the three terms?

Accepted Answer

$$\Delta H_{solute} \u003e 0;\ \Delta H_{solvent} \u003e 0;\ \Delta H_{mix} \u003c 0$$

Question 12

Based only on lattice energies, which compound would be expected to have the lowest solubility in water?

Accepted Answer

CaS

Question 13

The Henry's Law constant for CO in water at 25°C is $$9.71 	imes 10$$^{-4}$$\ \mathrm{mol/(L\cdot atm)}. $$How many grams of CO ($$M = 28.01\ \mathrm{g/mol}) $$will dissolve in 1.00 L of water if the partial pressure of CO is 2.75 atm?

Accepted Answer

$$7.48 	imes 10$$^{-2}$$\ \mathrm{g}$$

Question 14

Saccharin ($$M = 183.2\ \mathrm{g/mol}) $$has a solubility of 1.00 g per 290 mL of solution. What is the molarity of a saturated saccharin solution?

Accepted Answer

$$0.0188\ \mathrm{M}$$

Question 15

Calculate the molality of a solution prepared by dissolving 45.38 g of CdBr$$_2$$ ($$M = 272.22\ \mathrm{g/mol}) in 375.0 g of $$water.

Accepted Answer

$$0.4445\ m$$

Question 16

The solubility of potassium permanganate ($$M = 158.03\ \mathrm{g/mol}) is 7.1 g $$per 100.0 g of water at 25°C. What is the mole fraction of potassium permanganate in this solution?

Accepted Answer

0.0086

Question 17

From the following list of aqueous solutions, which one has the highest boiling point?

Accepted Answer

0.75 m CuCl$$_2$$

Question 18

What concentration of aqueous FeCl$$_3$$ would have the same osmotic pressure as a 0.20 M solution of CaCl$$_2 at $$the same temperature, assuming ideal behavior?

Accepted Answer

0.15 M

Question 19

Safrole is used as a topical antiseptic. Calculate the vapor pressure of a solution prepared by dissolving 0.75 mol of safrole in 950 g of ethanol ($$M = 46.07\ \mathrm{g/mol}$$). $$P^\circ_{ethanol} = 50.0$$ torr at 25°C.

Accepted Answer

48 torr

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