Q: A solution containing 22.5 mg of an unknown protein per 25.0 mL solution has an osmotic pressure of 2.18 torr at $25^\circ\mathrm{C}$. What is the molar mass of the protein? ($R = 0.0821\ \mathrm{L\cdot atm\cdot mol^{-1}\cdot K^{-1}}$, $1\ \mathrm{atm} = 760\ \mathrm{torr}$)

$7.64 \times 10^3\ \mathrm{g/mol}$

Question 1

Which of the following molecules exhibits the strongest dipole-dipole intermolecular forces?

Accepted Answer

$\mathrm{SO_2}$

Question 2

A solution contains 20 g of $\mathrm{KNO_3}$ per 100 g of water at $40^\circ\mathrm{C}$. According to the solubility chart, is the solution unsaturated, saturated, or supersaturated?

Accepted Answer

Unsaturated

Question 3

A solution containing 22.5 mg of an unknown protein per 25.0 mL solution has an osmotic pressure of 2.18 torr at $25^\circ\mathrm{C}$. What is the molar mass of the protein? ($R = 0.0821\ \mathrm{L\cdot atm\cdot mol^{-1}\cdot K^{-1}}$, $1\ \mathrm{atm} = 760\ \mathrm{torr}$)

Accepted Answer

$7.64 	imes 10^3\ \mathrm{g/mol}$

Question 4

Which process is best described as deposition?

Accepted Answer

A gas becomes a solid.

Question 5

Which intermolecular forces are present in $\mathrm{CH_3CH_2OH}$?

Accepted Answer

Dispersion, hydrogen bonding, and dipole-dipole forces are present.

Question 6

What is the strongest type of intermolecular force present in $\mathrm{CH_3CH_2NH_2}$?

Accepted Answer

Hydrogen bonding

Question 7

Which one of the following has a definite shape and volume?

Accepted Answer

A solid

Question 8

What is the molarity of a solution prepared by dissolving 200 g of $\mathrm{NH_4Cl}$ in enough water to make 1.00 L of solution? ($\mathrm{NH_4Cl}$ molar mass = $53.50\ \mathrm{g/mol}$)

Accepted Answer

$3.95\ \mathrm{M}$

Question 9

A solution is prepared by dissolving 49.3 g of AgI in enough water to form 473 mL of solution. Calculate the mass % of AgI in the solution if the density is $1.12\ \mathrm{g/mL}$.

Accepted Answer

$9.30\%$

Question 10

To increase the solubility of a gas in a liquid the most, which change should be made?

Accepted Answer

Decrease the temperature and raise the pressure.

Question 11

What is the mole fraction of ethanol in a solution made by dissolving 14.6 g of ethanol ($\mathrm{C_2H_5OH}$) in 53.6 g of water?

Accepted Answer

$0.0962$

Question 12

A solution is prepared by dissolving 40.0 g of sucrose ($\mathrm{C_{12}H_{22}O_{11}}$) in 250 g of water at $25^\circ\mathrm{C}$. What is the vapor pressure of the solution if the vapor pressure of pure water at $25^\circ\mathrm{C}$ is 23.8 mm Hg?

Accepted Answer

$23.56\ \mathrm{mm\ Hg}$

Question 13

Which molecule would you expect to be most soluble in water?

Accepted Answer

$\mathrm{CH_3CH_2CH_2OH}$

Question 14

Which of the following solutions will have the highest boiling point?

Accepted Answer

$0.100\ \mathrm{m}\ \mathrm{MgCl_2}$

Question 15

A solution is prepared by dissolving 0.100 mol of $\mathrm{C_2H_5OH}$ in 0.400 kg of water. What is the boiling point elevation? ($K_b = 0.512\ ^\circ\mathrm{C}\cdot\mathrm{kg/mol}$, boiling point of pure water = $100^\circ\mathrm{C}$)

Accepted Answer

$108^\circ\mathrm{C}$

Question 16

When 2.00 g of $\mathrm{NH_4Cl}$ is dissolved in 100 g of water, the temperature drops from $22.0^\circ\mathrm{C}$ to $20.8^\circ\mathrm{C}$. What is the enthalpy change for the dissolution process?

Accepted Answer

$20.8\ \mathrm{kJ}$ of heat are released.

Question 17

Choose the pair of substances that are most likely to form a homogeneous solution.

Accepted Answer

$\mathrm{NaCl}$ (ionic) and $\mathrm{CH_3OH}$ (polar)

Question 18

Determine the solubility of $\mathrm{CO_2}$ in soda water at $25^\circ\mathrm{C}$ if the pressure of $\mathrm{CO_2}$ is 7.0 atm. The Henry's law constant for carbon dioxide in water at this temperature is $3.4 	imes 10^{-2}\ \mathrm{mol/L\cdot atm}$.

Accepted Answer

$0.24\ \mathrm{M}$

General Chemistry: Solutions, Intermolecular Forces, and Colligative Properties – Study Notes

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