Chemistry, asked by Gurujeet, 1 month ago

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%

Answers

Answered by NoExist
4

Answer:

Let p be the vapour pressure of pure octane. The vapour pressure of solution will be

100

80

p=0.8 p.

Molar mass of solute (M) and octane (m) are 40 g/mol and 114 g/mol respectively. Mass of octane, w is 114 g

p-p÷p=Wm÷Mw

p-0.8p÷p=W×114÷40×114

W=8g

Hence, 8 g of solute are required.

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