An addition reaction is a reaction type where a molecule combines with another molecule to form one molecule. This is a unique type of reaction since no other product is being formed by this reaction only that one large molecule. An example is the addition of a hydrohalic acid to an alkene to yield a corresponding haloalkane.
Weight of solute = 45 g and weight of solvent = 55 g
M.wt of solute = 180 P⁰ = 526 mmHg
number of moles of solute = 45 / 180 = 0.25 mol
number of moles of solvent = 55 / 18 = 3.05 mol
According to Rault's law:

= 0.25 / (0.25 + 3.05)

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