# A chemist prepared a 25% by wt. glucose (C6H12O6) solution in water at 29C. Determine the vapor pressure lowering of the solution. The vapor pressure of pure water at 29C is 30 Torr. ? What is the answer in this problem?

To find the vapor pressure lowering, we start from Raoult's law for ideal solutions:

The change in vapor pressure above the solvent due to dissolving solute is defined as:

Mol fractions are always positive, so vapor pressure always decreases for dissolution of a nonvolatile solute into a solvent.

Therefore, we can calculate the mol fraction of solute:

As a result,

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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