Q: A 15.00 mL sample of an unknown HClO$$_4$$ solution requires titration with 17.03 mL of 0.1000 M NaOH to reach the equivalence point. What is the concentration of the unknown HClO$$_4$$ solution?

$$M = \frac{17.03 \times 0.1000}{15.00} = 0.1135 M$$

Q: A 125 mL sample of an unknown H$$_2SO$_4$$ solution requires titration with 50.0 mL of 0.500 M KOH to reach the equivalence point. What is the concentration of the unknown H$$_2SO$_4$$ solution?

$$M = \frac{50.0 \times 0.500}{2 \times 125} = 0.100 M$$

Q: A cylinder contains 7.5 L of nitrogen gas at a pressure of 1.00 atm and a temperature of 298 K. What is the mass of nitrogen in the cylinder? ($$R = 0.08206 L$$·atm·mol$$^{-1}$$·K$$^{-1}$$, molar mass of N$$_2 = 28.02 g/$$mol)

$$n = \frac{PV}{RT} = \frac{1.00 \times 7.5}{0.08206 \times 298} = 0.307$$ mol; mass = $$0.307 \times 28.02 = 8.60 g$$

Q: You mix a 25.0 mL sample of a 1.20 M potassium chloride solution with 15.0 mL of a 0.900 M barium nitrate solution. The precipitation reaction is: $$2\text{KCl}(aq) + \text{Ba(NO}_3)_2(aq) \rightarrow \text{BaCl}_2(s) + 2\text{KNO}_3(aq). If $$you collect 2.45 g of BaCl$$_2$$, what is the percent yield?

$$\%\text{yield} = \frac{2.45}{2.81} \times 100 = 87.2\%$$

Question 1

A 15.00 mL sample of an unknown HClO$$_4$$ solution requires titration with 17.03 mL of 0.1000 M NaOH to reach the equivalence point. What is the concentration of the unknown HClO$$_4$$ solution?

Accepted Answer

$$M = \frac{17.03 	imes 0.1000}{15.00} = 0.1135 M$$

Question 2

Which of the following compounds would be most soluble in water?

Accepted Answer

NaCl

Question 3

A 125 mL sample of an unknown H$$_2SO$_4$$ solution requires titration with 50.0 mL of 0.500 M KOH to reach the equivalence point. What is the concentration of the unknown H$$_2SO$_4$$ solution?

Accepted Answer

$$M = \frac{50.0 	imes 0.500}{2 	imes 125} = 0.100 M$$

Question 4

Which of the following processes releases the greatest amount of heat for 10 g of water?

Accepted Answer

Condensation of 10 g of gaseous water

Question 5

Which intermolecular forces are present in HF?

Accepted Answer

Dispersion, dipole-dipole, and hydrogen bonding

Question 6

Which of the following pairs of compounds will both conduct electricity in aqueous solution?

Accepted Answer

NaOH and MgSO$$_4$$

Question 7

Which of the following statements best explains why NaCl is soluble in water?

Accepted Answer

NaCl is ionic and water is polar, so the ions are stabilized by the polar water molecules.

Question 8

A cylinder contains 7.5 L of nitrogen gas at a pressure of 1.00 atm and a temperature of 298 K. What is the mass of nitrogen in the cylinder? ($$R = 0.08206 L$$·atm·mol$$^{-1}$$·K$$^{-1}$$, molar mass of N$$_2 = 28.02 g/$$mol)

Accepted Answer

$$n = \frac{PV}{RT} = \frac{1.00 	imes 7.5}{0.08206 	imes 298} = 0.307$$ mol; mass = $$0.307 	imes 28.02 = 8.60 g$$

Question 9

You mix a 25.0 mL sample of a 1.20 M potassium chloride solution with 15.0 mL of a 0.900 M barium nitrate solution. The precipitation reaction is: $$2	ext{KCl}(aq) + 	ext{Ba(NO}_3)_2(aq) ightarrow 	ext{BaCl}_2(s) + 2	ext{KNO}_3(aq). If $$you collect 2.45 g of BaCl$$_2$$, what is the percent yield?

Accepted Answer

$$\%	ext{yield} = \frac{2.45}{2.81} 	imes 100 = 87.2\%$$

Question 10

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

Accepted Answer

CH$$_3CH$_2OH$$

Question 11

Which of the following is the correct formula for calculating the heat required to raise the temperature of a substance?

Accepted Answer

$$q = m \cdot C_s \cdot \Delta T$$

Question 12

Which of the following is true about the solubility of ionic compounds in water?

Accepted Answer

Ionic compounds containing Na$$^+$$, K$$^+$$, or NH$$_4^+$$ are always soluble.

Question 13

Consider the precipitation reaction: $$2	ext{Na}_3	ext{PO}_4(aq) + 3	ext{CuCl}_2(aq) ightarrow 	ext{Cu}_3(PO_4$)_2(s) + 6	ext{NaCl}(aq). $$What volume of 0.150 M Na$$_3PO$_4$$ solution is necessary to completely react with 82.9 mL of 0.121 M CuCl$$_2$$?

Accepted Answer

$$44.6 mL$$

Question 14

Which molecule will have the higher rate of effusion at the same temperature: A (higher molar mass) or B (lower molar mass)?

Accepted Answer

B will have the higher rate of effusion.

Question 15

Which of the following pairs of compounds will NOT react to form a precipitate in aqueous solution?

Accepted Answer

KCl(aq) + CaS(aq)

Question 16

Which of the following compounds will NOT conduct electricity in aqueous solution?

Accepted Answer

C$$_{12}H$_{22}O$_{11}$$

Question 17

Which of the following molecules exhibits hydrogen bonding?

Accepted Answer

CH$$_3OH$$

Question 18

Which of the following is the correct formula for a simple dilution calculation?

Accepted Answer

$$M_1$$ $$V_1$$ = $$M_2$$ $$V_2$$

Question 19

2.00 mol of N$$_2(g) $$and 6.00 mol of H$$_2(g) $$are placed in a large piston at STP and react to completion: $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$. What will be the final volume of the piston?

Accepted Answer

89.6 L

General Chemistry II: Solutions, Intermolecular Forces, and Gases – Final Exam Review Notes

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