POST UTME BOWEN UNIVERSITY 2017 Chemistry | Objective
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Question 1
A 25.0 mL sample of a solution containing 0.100 M NaOH is titrated with 0.100 M HCl. If the reaction is represented by the equation: NaOH + HCl → NaCl + H2O, what is the volume of HCl required to reach the equivalence point?
Question 2
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of CO(g)?
Question 3
The reaction of sodium hydroxide with acetic acid is represented by the equation: CH3COOH + NaOH → CH3COONa + H2O. If 25.0 mL of 0.100 M CH3COOH is mixed with 25.0 mL of 0.100 M NaOH, what is the concentration of the resulting solution?
Question 4
A 0.1 M solution of NaOH is titrated with 0.1 M HCl. At the equivalence point, the pH of the solution is 7. Calculate the volume of HCl required to reach the equivalence point.
Question 5
A 2.5 M solution of sodium hydroxide (NaOH) is mixed with a 1.5 M solution of hydrochloric acid (HCl). What is the resulting concentration of the solution?
Question 6
The reaction between nitrogen dioxide (NO2) and water (H2O) produces nitric acid (HNO3) and nitric oxide (NO). The equation for this reaction is: NO2 + H2O → HNO3 + NO. If 2.5 moles of NO2 react with excess water, what is the limiting reac\tant?
Question 7
Determine the oxidation state of chromium in the compound K2Cr2O7.
Question 8
A polymer is formed by the condensation reaction between two monomers, A and B, with the following molecular formula: A_nB_m. If the degree of polymerization (n) is 100 and the ratio of A to B is 2:1, what is the molecular formula of the polymer?
Question 9
A gas is collected over water at a temperature of 25°C and a pressure of 1 atm. If the vapor pressure of water at 25°C is 23.8 mmHg, what is the partial pressure of the gas?
Question 10
A 2.0 g sample of a non-metallic element is heated in a stream of oxygen gas. The resulting product is a white solid that is soluble in water. What is the identity of the non-metallic element?
Question 11
A redox reaction involves the oxidation of Fe2+ to Fe3+ and the reduction of MnO4- to Mn2+. What is the half-reaction for the oxidation of Fe2+?
Question 12
Determine the molar mass of a polymer with the following composition: 60% polyethylene (C2H4)n, 20% polypropylene (C3H6)n, and 20% polyvinyl chloride (C2H3Cl)n. Given that the molar mass of polyethylene is 14.0 g/mol, the molar mass of polypropylene is 42.1 g/mol, and the molar mass of polyvinyl chloride is 62.5 g/mol.
Question 13
The s\tandard entropy change for the reaction 2H2(g) + O2(g) → 2H2O(l) is 143.6 J/K·mol. What is the s\tandard entropy change for the reaction H2(g) + 1/2O2(g) → H2O(l)?
Question 14
The reaction of hydrogen gas with nitrogen gas is represented by the equation: H2 + N2 → 2NH3. If 1.00 L of H2 is mixed with 1.00 L of N2, what is the limiting reac\tant?
Question 15
A 1.0 M solution of a weak acid is titrated with 1.0 M NaOH. The initial pH of the acid solution is 3.0. If 20 mL of NaOH is required to reach the equivalence point, what is the dissociation cons\tant of the acid?
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