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Title: Question has to solve. Principle of Chemistry Post by: AFFAN ALI on Jan 2, 2022 Lactose is naturally occurring sugar fgound in mammalian milk A 0.335.M solution of Lactose in water has density of 1.043 g/L at 20C what is the concentration of this solution in following units.mole fraction. Molality. Mass percentage
Title: Re: Question has to solve. Principle of Chemistry Post by: lurielbank on Jan 2, 2022 Let's take 1 litre of this solution.
Mass of this litre is 1043.2 g This contains 0.335 mol of lactose. Lactose is C12H22O11, its molar mass 342.30 g/mol. Mass of 0.335 mol = 0.335 \(\times\) 342.30 = 114.67 g Therefore, the 1 litre of solution, mass total 1043.2 g = 114.67 g lactose and 928.53 g H2O. You have 0.335 mol lactose dissolved in 928.53 g of H2O Molality is moles of solute dissolved in 1 kg solvent, which is 1000 g solvent. Molality = (0.335 \(\times\) 1000) / 928.53 = 0.360 m \(\therefore\) the molality = Title: Re: Question has to solve. Principle of Chemistry Post by: duddy on Jan 2, 2022 Try this: https://biology-forums.com/index.php?topic=99274.0
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