Problem: Consider two solutions, one formed by adding 10 g of glucose (C6 H12 O6 ) to 1 L of water and the other formed by adding 10 g of sucrose (C12 H22 O11 ) to 1 L of water.Calculate the vapor pressure for the second solution at 20 oC. (The vapor pressure of pure water at this temperature is 17.5 torr.)

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FREE Expert Solution

We are asked to calculate the vapor pressure for the second solution at 20 ^oC. 

Recall :

$\boxed{{\mathbf{P}}_{\mathbf{solution}}\mathbf{ }\mathbf{=}\mathbf{ }{\mathbf{X}}_{\mathbf{solvent}}{{\mathbf{P}}^{\mathbf{o}}}_{\mathbf{Solvent}}}$

We go through the following steps to solve the problem:

Step 1. Calculate the moles water

Step 2. Calculate the moles of sucrose (C₁₂ H₂₂ O₁₁ )

Step 3. Calculate the mole fraction of water

Step 4. Calculate the vapor pressure of  the solution