Liquid M and liquid N form an ideal solution. The vapour pressures of pure liquids M and N are 450 and 700 mmHg,…

Strategy:\n> For an ideal solution, the vapour is enriched in the more volatile component (Konovalov's Rule). Relate the liquid phase ratios to the vapour phase ratios using pure state vapour pressures.\n\nStep 1: Identify the more volatile component\n$P_N^\circ = 700\\text{ mm Hg}$ and $P_M^\circ = 450\\text{ mm Hg}$.\nN is more volatile.\n\nStep 2: Relate the ratios\n$y_M = \\frac{x_M P_M^\circ}{P_{\\text{total}}}, \quad y_N = \\frac{x_N P_N^\circ}{P_{\\text{total}}}$\nDividing the two:\n$\\frac{y_M}{y_N} = \\frac{x_M}{x_N} \cdot \\frac{P_M^\circ}{P_N^\circ}$\n\nStep 3: Analyze the inequality\nSince $P_M^\circ / P_N^\circ = 450 / 700 < 1$:\n$\\frac{y_M}{y_N} < \\frac{x_M}{x_N} \implies \\frac{x_M}{x_N} > \\frac{y_M}{y_N}$\n\n$\boxed{\\text{Answer: (1)}}$