Cinnamaldehyde (mm = 132.15 g/mol) is used as a flavoring agent. what mass of cinnamaldehyde must be added to 175 g of ethanol to give a solution whose boiling point is 82.7°c? kb = 1.22°c/m, boiling point of pure ethanol = 78.5°c

The mass of cinnamaldehyde that must be added is 79.6 grams.

Explanation:

Elevation in boiling point is defined as the difference in the boiling point of solution and freezing point of pure solution.

The equation used to calculate elevation in boiling point follows:

= ? °C

Boiling point of pure ethanol = 78.5°C

Boiling point of solution = 82.7°C  

Putting values in above equation, we get:

To calculate the elevation in boiling point, we use the equation:

Or,

where,

= 4.2°C

i = Vant hoff factor = 1 (For non-electrolytes)

= molal boiling point elevation constant = 1.22°C/m.g

= Given mass of solute (cinnamaldehyde) = ? g

= Molar mass of solute (cinnamaldehyde) = 132.15  g/mol

= Mass of solvent (ethanol) = 175 g

Putting values in above equation, we get:

Hence, the mass of cinnamaldehyde that must be added is 79.6 grams.

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