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Sagot :
Answer : Option A) Ethanoic Acid
Explanation : Ethanoic acid has the lowest vapor pressure i.e 0.08 atm at the temperature of 50°C compared to the other given options.
The vapour pressure of propanone at 50°C is 0.84 atm
Ethanol has vapour pressure as 0.30 atm at 50°C
water has vapour pressure of 0.12 atm at 50°C.
Answer : The correct option is, (1) ethanoic acid.
Explanation :
The relation between the boiling point and the inter-molecular force of attraction is that the higher the boiling point, the stronger the inter-molecular force of attraction that means it requires more energy to breaks the forces between the molecules. Or, the higher the boiling point lower will be the vapor pressure.
In ethanoic acid, the hydrogen bonding will be stronger as compared to the propanone, ethanol and water.
In propanone, the dipole-dipole interaction occurs.
In ethanol and water, the hydrogen bonding occurs but polarity will be less.
Hence, ethanoic acid has the lowest vapor pressure at [tex]50^oC[/tex]
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