I\'m not sure if I\'m right ? I need help of glucose (CaicOe) and 0 10 moles of

Question

I'm not sure if I'm right ? I need help

of glucose (CaicOe) and 0 10 moles of sucrose (Cozn) disaved in A solution consists of 0.20 moles of glucose (CeH-Oe) and 0.10 moles of sucrose (CaHzOm) dissolved in x moles of water (H2O). The vapor pressure of pure water is 42.2 tor at 35"C. The equation below represents the vapor pressure of the solution (Psounien) using Raoult's law x mol A soletionmol HO+B What chemical formula does A represent in the above equation? What number does B represent? Express your answer numerically Number

Explanation / Answer

Raoult's Law states that, in a solution of solids in liquids, the fraction change in partial pressure of the liquid is directly proportional to mole fraction of the solute

Thus, (P0water - Psolution)/P0water = mole fraction of solute

Now, moles of solute = moles of sucrose + moles of glucose = 0.3

Mole fraction of solute = moles of solute/(moles of solute + moles of solvent) = 0.3/(0.3+x)

Now, (P0water - Psolution)/P0water = 0.3/(0.3+x)

or, (P0water - Psolution) = {0.3/(0.3+x)}*P0water

or, P0water - {0.3/(0.3+x)}*P0water = Psolution

or, {x*P0water}/(0.3+x) = Psolution    ; where P0water = vapour pressure of pure water ; Psolution = vapour pressure of solution

Thus,

1) H2O

2) 0.3

3) 42.2

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