POST UTME VERITAS UNIVERSITY 2017 Chemistry | Objective

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Question 1
Calculate the s\tandard enthalpy of formation of CO2(g) from the following equation: C(s) + O2(g) → CO2(g). The s\tandard enthalpy of formation of C(s) is -393.5 kJ/mol, and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
A. -393.5 kJ/mol
B. -393.5 kJ/mol + 0 kJ/mol
C. -393.5 kJ/mol + 0 kJ/mol + 0 kJ/mol
D. -393.5 kJ/mol + 0 kJ/mol + 0 kJ/mol + 0 kJ/mol
Question 2
A 2.0 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the volume of the gas at 37°C, given that the gas cons\tant R = 0.0821 L atm K^-1 mol^-1.
A. 2.1 L
B. 2.2 L
C. 2.3 L
D. 2.4 L
Question 3
A solution contains 0.1 M HCl and 0.2 M NaOH. Calculate the pH of the solution.
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 4
A 2.5 g sample of a non-volatile solute is dissolved in 25 g of water to form a solution. Calculate the molality of the solution.
A. \( 0.1 \text{ m} \)
B. \( 0.2 \text{ m} \)
C. \( 0.3 \text{ m} \)
D. \( 0.4 \text{ m} \)
Question 5
A 10.0 mL sample of a solution containing 0.1 M HCl is titrated with 0.1 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
A. 0.01 mol
B. 0.02 mol
C. 0.03 mol
D. 0.04 mol
Question 6
A polymer has a molecular weight of 100,000 g/mol and a degree of polymerization of 500. What is the molar mass of the repeating unit?
A. 200
B. 400
C. 500
D. 600
Question 7
Determine the structure of the compound formed by the reaction of 2-methylpropane with chlorine gas, given that the reaction is a free-radical ha\logenation.
A. \( \text{CH}_3 \text{CH}_2 \text{CH}_2 \text{Cl} \)
B. \( \text{CH}_3 \text{CH}_2 \text{CH}_2 \text{CH}_2 \text{Cl} \)
C. \( \text{CH}_3 \text{CH}_2 \text{CH}\( \text{Cl})\text{CH}_3 \ \)
D. \( \text{CH}_3 \text{CH}\( \text{Cl})\text{CH}_2 \text{CH}_3 \ \)
Question 8
A 100.0 mL sample of a 0.1 M solution of NaOH is titrated with a 0.1 M solution of HCl. Calculate the volume of HCl required to reach the equivalence point.
A. 50.0 mL
B. 75.0 mL
C. 100.0 mL
D. 125.0 mL
Question 9
A 0.1 M solution of a weak acid HA is titrated with 0.1 M NaOH. If 20 mL of NaOH is required to reach the equivalence point, what is the pH of the resulting solution?
A. 3
B. 4
C. 5
D. 6
Question 10
A 0.1 M solution of sodium carbonate is titrated with a 0.1 M solution of hydrochloric acid. Calculate the pH of the solution after 50 mL of the acid has been added.
A. \( \text{pH} = 7 \)
B. \( \text{pH} = 9 \)
C. \( \text{pH} = 10 \)
D. \( \text{pH} = 11 \)
Question 11
A non-metal has an atomic number of 16 and an atomic mass of 32 g/mol. What is the symbol of the non-metal?
A. S
B. P
C. Cl
D. Br
Question 12
A mixture of 2.0 g of sodium chloride (NaCl) and 1.5 g of potassium chloride (KCl) is dissolved in 100 mL of water. Calculate the osmotic pressure of the solution at 25°C.
A. 2.0 atm
B. 2.5 atm
C. 3.0 atm
D. 3.5 atm
Question 13
A sample of carbon dioxide gas is collected over water at a temperature of 25°C and a pressure of 1 atm. The volume of the gas is 2.5 L. Calculate the partial pressure of the CO2 gas.
A. 0.5 atm
B. 0.75 atm
C. 1.0 atm
D. 1.25 atm
Question 14
A 2.5 M solution of sodium hydroxide (NaOH) is prepared by dissolving 25 g of NaOH in water to make 1 L of solution. Calculate the molarity of the solution.
A. M = \frac{25 g}{1 L} \times \frac{1 mol}{40 g}
B. M = \frac{25 g}{1 L} \times \frac{1 mol}{20 g}
C. M = \frac{25 g}{1 L} \times \frac{1 mol}{10 g}
D. M = \frac{25 g}{1 L} \times \frac{1 mol}{5 g}
Question 15
Calculate the molar mass of the following compound: CH3CH2CH2OH.
A. 30.07 g/mol
B. 32.04 g/mol
C. 34.08 g/mol
D. 36.12 g/mol

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