# Can you help me out please? Thanks!

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When a 2.5 mol of sugar (C12H22O11) are added to a certain amount of water the boiling point is raised by 1 Celsius degree. If 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? Show all calculations leading to your answer OR use 3 – 4 sentences to explain your answer.

When a 2.5 mol of sugar (C12H22O11) are added to a certain amount of water the boiling point is raised by 1 Celsius degree. If 2.5 mol of aluminum nitrate is added to the same amount of water, by how much will the boiling point be changed? Show all calculations leading to your answer OR use 3 – 4 sentences to explain your answer.

##### 1 Answer

The boiling point will be raised by 4 °C.

#### Explanation:

The formula for boiling point elevation

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where

**van't Hoff #i#-factor** for the solute

**molal boiling point elevation constant**of the solvent

**molal concentration**(molality) of the solute

If we have two different solutions of the same molality in the same solvent, we can write

or

Let

Sucrose is a covalent compound. It does not dissociate in solution, so

Aluminium nitrate is a soluble ionic compound. It dissociates in solution according to the equation

Thus, 1 mol of solute forms 4 mol of particles, and

∴