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At $\mathrm{T}(\mathrm{K})$, the vapour pressures of two liquids, heptane and octane are $106 \mathrm{kPa}$ and $47 \mathrm{kPa}$ respectively. If $25 \mathrm{~g}$ of heptane and $57 \mathrm{~g}$ of octane form an ideal solution, at $\mathrm{T}(\mathrm{K})$ the vapour pressure of solution in $\mathrm{kPa}$ is :
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66.66
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