Q: Which of the following is the correct formula for calculating the percent hydrolysis of a weak base?

$\%\text{ hydrolysis} = \frac{\text{amount hydrolyzed}}{\text{initial amount}} \times 100$

Question 1

Which of the following statements best describes the difference between a state function and an extensive property?

Accepted Answer

A state function is independent of the path taken, while an extensive property depends on the amount of substance present.

Question 2

A buffer is made by dissolving 1.12 g of sodium propionate (C3H5COONa) in 0.100 L solution that contains 0.090 mol of propionic acid (C3H6O2). For propionic acid, $K_a = 1.3 	imes 10^{-5}$. What is the pH of the buffer? (Assume no volume change.)

Accepted Answer

$pH = 5.03$

Question 3

Which of the following is the correct formula for the hypobromite ion?

Accepted Answer

$BrO^-$

Question 4

Given the reaction $2 CH_4 (g) + 2 H_2O (g) \rightarrow C_2H_4 (g) + 4 H_2 (g)$ and the following thermodynamic data: $\Delta G^\circ(CH_4) = -50.8$ kJ/mol, $\Delta G^\circ(H_2O) = -228.6$ kJ/mol, $\Delta G^\circ(C_2H_4) = 68.1$ kJ/mol, $\Delta G^\circ(H_2) = 0$ kJ/mol. What is the equilibrium constant $K_{eq}$ for this reaction at 25°C?

Accepted Answer

$K_{eq} = 4.6 	imes 10^{-7}$

Question 5

Which of the following best describes a strong electrolyte?

Accepted Answer

A compound that completely ionizes in water, such as NaCl.

Question 6

Calculate the pH of a 0.0020 M NaOH solution.

Accepted Answer

$pH = 11.30$

Question 7

Which of the following equations correctly relates the Gibbs free energy change to the equilibrium constant?

Accepted Answer

$\Delta G = -RT \ln K_{eq}$

Question 8

A solution contains 0.0350 M Ca(OH)$_2$. What is the pOH of the solution?

Accepted Answer

$pOH = 1.46$

Question 9

Which of the following is true about the relationship between $K_c$ and $K_p$ for a reaction involving gases?

Accepted Answer

$K_p = K_c(RT)^{\Delta n}$, where $\Delta n$ is the change in moles of gas.

Question 10

Which of the following is the correct balanced equation for the reaction of cyclohexane ($C_6H_{12}$) with oxygen to produce adipic acid ($C_6H_{10}O_4$) and water?

Accepted Answer

$2 C_6H_{12} + 5 O_2 \rightarrow 2 C_6H_{10}O_4 + 2 H_2O$

Question 11

Which of the following ions has 18 electrons and a net charge of +2?

Accepted Answer

$Ca^{2+}$

Question 12

A 1.4 × 10$^{-3}$ mol of argon is placed in a 250 mL bulb. What is the pressure of the argon gas in the light bulb at 27°C? (Use $R = 0.0821$ L·atm·mol$^{-1}$·K$^{-1}$)

Accepted Answer

$P = 0.13$ atm

Question 13

Which of the following is an example of a weak electrolyte?

Accepted Answer

CH$_3$COOH

Question 14

Which of the following best describes the role of an oxidizing agent in a redox reaction?

Accepted Answer

It gains electrons and is reduced.

Question 15

Calculate the $\Delta H$ for the reaction: $C (s) + H_2O (g) \rightarrow CO (g) + H_2 (g)$ given the following thermochemical equations:
$C (s) + O_2 (g) \rightarrow CO_2 (g)$ $\Delta H = -393.5$ kJ
$2 CO (g) + O_2 (g) \rightarrow 2 CO_2 (g)$ $\Delta H = -566.0$ kJ
$2 H_2 (g) + O_2 (g) \rightarrow 2 H_2O (g)$ $\Delta H = -483.6$ kJ

Accepted Answer

$\Delta H = +131.3$ kJ

Question 16

Which of the following is the correct expression for the equilibrium constant $K_c$ for the reaction $SOCl_2 (g) \rightarrow SO_2 (g) + Cl_2 (g)$?

Accepted Answer

$K_c = \frac{[SO_2][Cl_2]}{[SOCl_2]}$

Question 17

Which of the following statements about entropy ($\Delta S$) is correct?

Accepted Answer

Entropy is a measure of disorder and tends to increase in spontaneous processes.

Question 18

A solution is prepared by adding 15.0 mL of 0.25 M KOH to 35.0 mL of 0.15 M HBr. What is the final pH of the solution?

Accepted Answer

$pH = 1.85$

Question 19

Which of the following is the correct formula for calculating the percent hydrolysis of a weak base?

Accepted Answer

$\%	ext{ hydrolysis} = \frac{	ext{amount hydrolyzed}}{	ext{initial amount}} 	imes 100$

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