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

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Calculate the mass of a non-volatile solute ( molecular mass 40 ) which should be dissolved in 114g octane to reduce its vapour pressure to 80% . Select the correct answer from above options

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Correct Answer - 10g p∘=100,pS=80 W1=114g n1= 114 114 =1(Mw or octane =114) p∘-pS p∘ = 20 100 = n2 n1+n2 = W2/40 1+(W2/40) 1 5 (1+ W2 40 )= W2 40 W2=10g

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