POST UTME UNIPORT 2018 Chemistry | Objective
Practice these randomly selected questions to test your readiness.
Question 1
A reaction is represented by the equation: 2A + B → 2C + D. If the rate of disappearance of A is 0.05 M/s and the rate of appearance of C is 0.02 M/s, what is the rate of appearance of D?
Question 2
A sample of gas has a volume of 2.5 L at a pressure of 1.5 atm and a temperature of 300 K. What is the volume of the gas at a pressure of 3.0 atm and a temperature of 400 K?
Question 3
A solution of 0.1M HCl is mixed with a solution of 0.1M NaOH. What is the pH of the resulting solution?
Question 4
The reaction: 2H2(g) + O2(g) → 2H2O(l) has a s\tandard enthalpy change (ΔH°) of -572 kJ/mol. Calculate the s\tandard entropy change (ΔS°) for the reaction, given that the s\tandard entropy of H2(g) is 130.7 J/mol·K, the s\tandard entropy of O2(g) is 205.14 J/mol·K, and the s\tandard entropy of H2O(l) is 70.0 J/mol·K.
Question 5
A 2.00 L sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of NaOH required to reach the equivalence point.
Question 6
A solution of 0.1 M HCl is electrolyzed u\sing a platinum electrode. If the cell potential is 2.0 V, what is the mass of hydrogen gas produced at the cathode in 2 hours?
Question 7
A 25.0 mL sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the pH of the solution after the addition of 25.0 mL of NaOH.
Question 8
The s\tandard enthalpy of formation of CO2 is -393.5 kJ/mol. Calculate the s\tandard enthalpy of formation of H2O(g) if the s\tandard enthalpy of formation of H2(g) is 0 kJ/mol and the s\tandard enthalpy of formation of O2(g) is 0 kJ/mol.
Question 9
The reaction: 2H2(g) + O2(g) → 2H2O(l) has a s\tandard enthalpy change (ΔH°) of -572 kJ/mol. Calculate the s\tandard entropy change (ΔS°) for the reaction, given that the s\tandard entropy of H2(g) is 130.7 J/mol·K, the s\tandard entropy of O2(g) is 205.14 J/mol·K, and the s\tandard entropy of H2O(l) is 70.0 J/mol·K.
Question 10
A sample of an ideal gas is heated from 300 K to 400 K at cons\tant volume. Calculate the change in entropy of the gas, given that the molar heat capacity at cons\tant volume is 20.8 J/mol·K.
Question 11
A 3.00 L sample of 0.100 M HCl is titrated with 0.100 M NaOH. Calculate the number of moles of HCl present in the initial solution.
Question 12
The reaction of an alkane with chlorine gas in the presence of light produces a chloroalkane. If 1.0 g of the alkane is reacted with 1.0 g of chlorine gas, what is the percentage yield of the chloroalkane if 0.8 g of the product is obtained?
Question 13
A 1.00 M solution of a weak acid HA is 10.0% dissociated at 25.0°C. What is the pH of the solution?
Question 14
The reaction: 2H2(g) + O2(g) → 2H2O(l) has a s\tandard enthalpy change (ΔH°) of -572 kJ/mol. Calculate the s\tandard entropy change (ΔS°) for the reaction, given that the s\tandard entropy of H2(g) is 130.7 J/mol·K, the s\tandard entropy of O2(g) is 205.14 J/mol·K, and the s\tandard entropy of H2O(l) is 70.0 J/mol·K.
Question 15
The s\tandard enthalpy of formation of CO2(g) is -393.5 kJ/mol. What is the s\tandard enthalpy of formation of H2O(l)?
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.
Unlock Full Access
Available for Android & Windows