Practice post utme joseph ayo babalola university chemistry 2017 Past Questions

Question 1

Determine the s\tandard enthalpy of formation of CaCO3(s) from the following data: ΔHf(CaO(s)) = -635.09 kJ/mol, ΔHf(CO2(g)) = -393.51 kJ/mol, ΔHf(C(s)) = 0 kJ/mol.

Correct A. -1206.60 kJ/mol

B. -1206.61 kJ/mol

C. -1206.59 kJ/mol

D. -1206.62 kJ/mol

Correct Answer: A

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Question 2

A 0.500 M solution of NaOH is mixed with a 0.500 M solution of HCl. What is the pH of the resulting solution?

A. 2.00

Correct B. 7.00

C. 10.00

D. 12.00

Correct Answer: B

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Question 3

A diagram of a titration setup is shown below. If 25.0 mL of 0.100 M NaOH is required to reach the equivalence point, what is the concentration of the HCl solution?

Correct A. 0.100 M

B. 0.0500 M

C. 0.200 M

D. 0.05000 M

Correct Answer: A

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Question 4

A 2.00 g sample of a polymer is dissolved in 100.0 mL of a solvent. The resulting solution has a vis\cosity of 1.50 cP. What is the molar mass of the polymer?

A. 1000 g/mol

Correct B. 2000 g/mol

C. 5000 g/mol

D. 10000 g/mol

Correct Answer: B

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Question 5

A 1.00 M solution of HCl is mixed with a 1.00 M solution of NaOH. What is the resulting pH?

A. 1.00

Correct B. 7.00

C. 10.00

D. 12.00

Correct Answer: B

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Question 6

A 25cm3 sample of 0.2M HCl is titrated with 0.1M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 12.5cm3

B. 25cm3

Correct C. 37.5cm3

D. 50cm3

Correct Answer: C

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Question 7

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(l) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and that of O2(g) is 0 kJ/mol.

A. -241.8 kJ/mol

Correct B. -285.8 kJ/mol

C. -393.5 kJ/mol

D. -483.5 kJ/mol

Correct Answer: B

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Question 8

A 10g sample of a non-metallic element has a density of 5.5 g/cm3. What is the volume of the sample in cm3?

Correct A. 1.82 cm3

B. 2.27 cm3

C. 3.18 cm3

D. 4.55 cm3

Correct Answer: A

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Question 9

A solution contains 0.1M HCl and 0.2M NaOH. What is the pH of the solution?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 10

A 25cm3 sample of 0.1M HCl is titrated with 0.2M NaOH. Calculate the volume of NaOH required to reach the equivalence point.

A. 12.5cm3

B. 25cm3

Correct C. 37.5cm3

D. 50cm3

Correct Answer: C

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Question 11

The electrolysis of water produces hydrogen gas at the cathode and oxygen gas at the anode. If 2.0 g of hydrogen gas is collected at the cathode, what is the volume of oxygen gas collected at the anode, assuming a cons\tant temperature and pressure?

A. 0.125 L

B. 0.25 L

Correct C. 0.5 L

D. 1.0 L

Correct Answer: C

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Question 12

A 2.0 M solution of acetic acid (CH3COOH) is titrated with a 1.0 M solution of sodium hydroxide (NaOH). If 25.0 mL of NaOH is required to reach the equivalence point, what is the volume of acetic acid required to reach the equivalence point?

A. 12.5 mL

Correct B. 25.0 mL

C. 50.0 mL

D. 100.0 mL

Correct Answer: B

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Question 13

A solution containing 0.10 M NaCl is electrolyzed u\sing a platinum electrode. If the electrolysis is carried out for 2.0 hours, what is the mass of Cl2 gas produced at the anode?

A. 0.50 g

B. 1.0 g

Correct C. 2.0 g

D. 4.0 g

Correct Answer: C

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Question 14

A 1.0 M solution of ethanol (C2H5OH) is mixed with a 2.0 M solution of water (H2O). If the resulting solution is 1.5 M, what is the mole \fraction of ethanol in the resulting solution?

A. 0.25

B. 0.33

Correct C. 0.50

D. 0.67

Correct Answer: C

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Question 15

A 2.0 M solution of sodium hydroxide (NaOH) is mixed with a 1.0 M solution of acetic acid (CH3COOH). If the resulting solution is 1.5 M, what is the mole \fraction of sodium acetate (CH3COONa) in the resulting solution?

A. 0.25

B. 0.33

Correct C. 0.50

D. 0.67

Correct Answer: C

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Question 16

The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of CaCO3(s) if the s\tandard enthalpy of formation of CaO(s) is -635.09 kJ/mol and that of CO2(g) is -393.5 kJ/mol.

A. -1207.19 kJ/mol

B. -1207.19 kJ/mol

C. -1207.19 kJ/mol

Correct D. -1207.19 kJ/mol

Correct Answer: D

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Question 17

The s\tandard Gibbs free energy of formation of a compound is related to its s\tandard enthalpy of formation and s\tandard entropy of formation by the equation: \Delta G_f^\circ = \Delta H_f^\circ - T\Delta S_f^\circ. If the s\tandard Gibbs free energy of formation of a compound is -100.5 kJ/mol at 298 K, and the s\tandard enthalpy of formation is -393.5 kJ/mol, calculate the s\tandard entropy of formation.

A. 1.33 kJ/mol*K

B. 1.33 kJ/mol*K

C. 1.33 kJ/mol*K

Correct D. 1.33 kJ/mol*K

Correct Answer: D

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Question 18

The s\tandard Gibbs free energy of formation of a compound is related to its s\tandard enthalpy of formation and s\tandard entropy of formation by the equation: \Delta G_f^\circ = \Delta H_f^\circ - T\Delta S_f^\circ. If the s\tandard Gibbs free energy of formation of a compound is -100.5 kJ/mol at 298 K, and the s\tandard enthalpy of formation is -393.5 kJ/mol, calculate the s\tandard entropy of formation.

A. 1.33 kJ/mol*K

B. 1.33 kJ/mol*K

C. 1.33 kJ/mol*K

Correct D. 1.33 kJ/mol*K

Correct Answer: D

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Question 19

The s\tandard Gibbs free energy of formation of a compound is related to its s\tandard enthalpy of formation and s\tandard entropy of formation by the equation: \Delta G_f^\circ = \Delta H_f^\circ - T\Delta S_f^\circ. If the s\tandard Gibbs free energy of formation of a compound is -100.5 kJ/mol at 298 K, and the s\tandard enthalpy of formation is -393.5 kJ/mol, calculate the s\tandard entropy of formation.

A. 1.33 kJ/mol*K

B. 1.33 kJ/mol*K

C. 1.33 kJ/mol*K

Correct D. 1.33 kJ/mol*K

Correct Answer: D

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Question 20

The s\tandard Gibbs free energy of formation of a compound is related to its s\tandard enthalpy of formation and s\tandard entropy of formation by the equation: \Delta G_f^\circ = \Delta H_f^\circ - T\Delta S_f^\circ. If the s\tandard Gibbs free energy of formation of a compound is -100.5 kJ/mol at 298 K, and the s\tandard enthalpy of formation is -393.5 kJ/mol, calculate the s\tandard entropy of formation.

A. 1.33 kJ/mol*K

B. 1.33 kJ/mol*K

C. 1.33 kJ/mol*K

Correct D. 1.33 kJ/mol*K

Correct Answer: D

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Question 21

A polymer is formed from the condensation reaction of a diol and a diacid. If the molecular weight of the diol is 180 g/mol and the molecular weight of the diacid is 150 g/mol, what is the molecular weight of the polymer formed?

A. 22.5 g/mol

Correct B. 27.3 g/mol

C. 30.0 g/mol

D. 32.5 g/mol

Correct Answer: B

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Question 22

A solution of sodium chloride (NaCl) is prepared by dissolving 35.5 g of NaCl in 250 mL of water. What is the molarity of the solution?

Correct A. 0.14 M

B. 0.18 M

C. 0.22 M

D. 0.26 M

Correct Answer: A

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Question 23

A mixture of 2.5 g of an unknown solid and 25 mL of ethanol is heated to produce a solution. If the density of the solution is 1.05 g/mL, what is the molarity of the solution?

A. 0.10 M

B. 0.12 M

Correct C. 0.15 M

D. 0.18 M

Correct Answer: C

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Question 24

A solution of hydrochloric acid (HCl) is prepared by dissolving 25 mL of HCl in 250 mL of water. What is the pH of the solution?

A. 1.3

Correct B. 1.5

C. 1.7

D. 1.9

Correct Answer: B

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Question 25

A mixture of 10 g of an unknown solid and 50 mL of ethanol is heated to produce a solution. If the density of the solution is 1.05 g/mL, what is the molarity of the solution?

A. 0.19 M

Correct B. 0.22 M

C. 0.25 M

D. 0.28 M

Correct Answer: B

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