On mixing, heptane and octane form an ideal solution. At 373 K, the vapour pressusres of the two liquid components (haptane and octane) are 105 kPa and 45 kPa respectively. Vapour pressure of the solution obtained by mixing 25.0g of heptane and 35 g of octane will be (molar mass of heptane = 100 g ${\text{mol}}^{-1}$ and dof octane = 114 ${\text{g mol}}^{-1}$).

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