Calculate the mass of a non volatile solute molar mass 40
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Calculate the mass of a non-volatile solute (molar mass 40 g mol-1) which should be dissolved in 114 g octane to reduce its vapour pressure to 80%. Let the vapour pressure of pure octane be p10. Then, the vapour pressure of the octane after dissolving the non-volatile solute is 80/100 p10 = 0.8 p10.
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7. First-Order Phase Transitions
In the absence of latent heat and volume change above the critical point the surfaces of the Gibbs free energy G for the liquid and the gas phase do not intersect any more. Instead the system passes continuously along a single G-surface
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