NEET Chemistry: Thermodynamics — Practice Set 9

Q1. Calculate the work done when 2 mol of an ideal gas expands adiabatically and reversibly from 10 L to 20 L at 600 K (\(\gamma = 1.4\)). (\(R = 8.314 \, \text{J/mol·K}\))

Q2. Calculate \(\Delta H\) for \(2C(s) + 3H_2(g) \rightarrow C_2H_6(g)\) if \(\Delta H_f^\circ (C_2H_6,g) = -84.7 \, \text{kJ/mol}\).

Q3. Calculate \(\Delta H\) for \(C(s) + H_2O(g) \rightarrow CO(g) + H_2(g)\) given: \(C(s) + O_2(g) \rightarrow CO_2(g)\), \(\Delta H = -393.5 \, \text{kJ/mol}\); \(CO(g) + \frac{1}{2}O_2(g) \rightarrow CO_2(g)\), \(\Delta H = -283 \, \text{kJ/mol}\); \(H_2O(g) \rightarrow H_2(g) + \frac{1}{2}O_2(g)\), \(\Delta H = 241.8 \, \text{kJ/mol}\).

Q4. Which of the following represents an extensive property?

Q5. For an ideal gas, if \(C_v = 12.5 \, \text{J/mol·K}\), what is \(C_p\)? (\(R = 8.314 \, \text{J/mol·K}\))

Q6. Which of the following is true for an endothermic process with \(\Delta S > 0\)?

Q7. For the reaction \( C_2H_2(g) + \frac{5}{2}O_2(g) \rightarrow 2CO_2(g) + H_2O(l) \), \( \Delta H = -1299.5 \, \text{kJ/mol} \) at 298 K. What is \( \Delta U \)? (\( R = 8.314 \, \text{J/mol·K} \))

Q8. Calculate \(\Delta H\) for \(C_3H_8(g) + 5O_2(g) \rightarrow 3CO_2(g) + 4H_2O(l)\) using: \(\Delta H_f^\circ (C_3H_8,g) = -103.8 \, \text{kJ/mol}\), \(\Delta H_f^\circ (CO_2,g) = -393.5 \, \text{kJ/mol}\), \(\Delta H_f^\circ (H_2O,l) = -285.8 \, \text{kJ/mol}\).

Q9. For a reaction with \(\Delta H = -120 \, \text{kJ}\) and \(\Delta G = -130 \, \text{kJ}\) at 298 K, what is \(\Delta S\)?

Q10. A reaction has \(\Delta H = 60 \, \text{kJ/mol}\) and \(\Delta S = 150 \, \text{J/K}\). At what temperature does \(\Delta G = 0\)?

Chemistry — Thermodynamics

Set 9 of 20

15:00

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1Question 1 of 10
Medium

Calculate the work done when 2 mol of an ideal gas expands adiabatically and reversibly from 10 L to 20 L at 600 K (\(\gamma = 1.4\)). (\(R = 8.314 \, \text{J/mol·K}\))