One mole of an ideal gas at 300 K expands from 5.00 bar to 1.00 bar while its temperature is held at 300 K. Path I is reversible. Path II is a single step against a constant external pressure of 1.00 bar. Which of the following statements are correct?

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One mole of an ideal gas at $300\ \text{K}$ expands from $5.00\ \text{bar}$ to $1.00\ \text{bar}$ while its temperature is held at $300\ \text{K}$ . Path I is reversible. Path II is a single step against a constant external pressure of $1.00\ \text{bar}$ . Which of the following statements are correct?

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← One mole of liquid benzene boils at its boiling point, 353.2 K, under a constant pressure of 1 bar. The enthalpy of vaporisation is 30.8 kJ mol⁻¹. Treat the vapour as an ideal gas and neglect the volume of the liquid. With w the work done on the system (R = 8.314 J K⁻¹ mol⁻¹), which pair of values is correct?For 2 NO(g) + O₂(g) → 2 NO₂(g): Δf H° of NO(g) is +90.25 and of NO₂(g) +33.18 kJ mol⁻¹; the standard molar entropies are NO(g) 210.8, O₂(g) 205.1 and NO₂(g) 240.1 J K⁻¹ mol⁻¹. Take Δ H° and Δ S° as constant. Which of the following statements are correct? →

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