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Calculate the mass of a non-volatile sol...

Calculate the mass of a non-volatile solute (molar mass 40 g `mol^(-1)`) which should be dissolved in 114g octane to reduce its vapour pressure to 80%.

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`P_(s)=(80P^(@))/(P_(S))=(W_(B)xxm_(A))/(m_(B)xxW_(A))`
`(P^(@)-(80P^(2))/100)/((80P^(@))/100)=(W_(B)xx114)/(40xx114)` i.e. `W_(B) =10 g`
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