The vapour pressure of water at math xmlns=http://www.w3.org/1998/Math/MathMLmn20/mnmo°/momi...

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The vapour pressure of water at math xmlns=http://www.w3.org/1998/Math/MathMLmn20/mnmo°/momi mathvariant=normalC/mi/math is 17.54 mm. When 20 g of a non-ionic, substance is dissolved in 100 g of water, the vapour pressure is lowered by 0.30 mm. What is the molecular weight of the substances
(1) 210.2
(2) 206.88
(3) 215.2
(4) 200.8
 
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