Question

The boiling points of diethyl ether, acetone and n-butyl alcohol are $35°\mathrm{C},56°\mathrm{C}\mathrm{and}118°\mathrm{C}$ respectively. Which one of the following correctly represents their boiling points in the kelvin scale?

• A. $306\mathrm{K},329\mathrm{K},391\mathrm{K}$
• B. $308\mathrm{K},329\mathrm{K},392\mathrm{K}$
• C. $308\mathrm{K},329\mathrm{K},391\mathrm{K}$
• D. $329\mathrm{K},392\mathrm{K},308\mathrm{K}$

Answer 1

The correct option is C

$308\mathrm{K},329\mathrm{K},391\mathrm{K}$

Explanation for the correct option:

Option (C):$308\mathrm{K},329\mathrm{K},391\mathrm{K}$

• The temperature measured on the Celsius scale is known as the Celsius temperature.
• Whereas the Kelvin scale is defined as the absolute scale which exists as the temperature which is colder than the freezing point of ice,$$0^{o}C$$which is represented on the Celsius scale.
• The formula for converting the Celsius temperature into Kelvin is given:
  $$K{=}^{o}C+273$$
• So the temperature for Diethyl ether in Kelvin will be $={35}^{\mathrm{o}}\mathrm{C}+273=308\mathrm{K}$
• Also, the temperature for Acetone in Kelvin will be $={56}^{\mathrm{o}}\mathrm{C}+273=329\mathrm{K}$
• Also, the temperature for n-Butyl alcohol in Kelvin will be $={118}^{\mathrm{o}}\mathrm{C}+273=391\mathrm{K}$

Hence, the given option, which represents their boiling points in the kelvin scale is $308\mathrm{K},329\mathrm{K},391\mathrm{K}$.