For a mixture of n-butane (1) + n-pentane (2) at 25C, what would be the predicted bubble-point

Question:

For a mixture of n-butane (1) + n-pentane (2) at 25°C, what would be the predicted bubble-point pressure using Raoult’s Law if your mixture was 20% n-butane by mole? Would you expect Raoult’s Law to be a good model for this system? Why or why not?

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