Question

What is the boiling point of water?
A.100K
B.273K
C.373K
D.300K

Answer 1

Hint: We must know that the boiling point of water in degree Celsius is $100^o$C. Use this to calculate the boiling point in Kelvin scale.

Formula Used: Kelvin scale = Celsius + 273

Complete step by step solution:
First, let’s discuss the boiling point, as we know boiling point is basically the point where a liquid boils and gets converted to vapour. In a more scientific explanation, we can say that boiling point is the point where the vapour pressure of the liquid is equal to the pressure of the surrounding.
Temperature is normally measured using three scales, kelvin, Fahrenheit and Celsius. Almost all of us are aware that water has a boiling point of $100^o$C.
To convert Celsius into the Kelvin scale, we simply add 273 to it (given in the formula above). Using this,
Boiling point of water = \[100 + 273\]
Boiling point of water = 373
So we can see that the boiling point of water in the Kelvin scale is 373 K.
So, the answer to this question is C. 373K

Additional Information:
For converting the Celsius scale to Fahrenheit we us the formula\[\left( {x^\circ C{\text{ }} \times {\text{ }}9/5} \right){\text{ }} + {\text{ }}32{\text{ }} = {\text{ }}y^\circ F\].
So, the boiling point in °F will be\[\left( {100^\circ C{\text{ }} \times {\text{ }}9/5} \right){\text{ }} + {\text{ }}32{\text{ }} = {\text{ }}212^\circ F\].
The boiling process is used in many industries for the generation of steam which is further used in many places.
There is another concept of boiling point elevation, which states that when we add a non-volatile solute to water or any liquid we want to boil, there is an increase in the boiling point temperature. This elevation in boiling point is due to the interactions between solid solute and the liquid solvent.


Note: We must understand that the concept of boiling point and boiling point elevation is really important as many questions are based on this concept. Boiling point is a physical phenomenon when liquid changes into vapour at a particular temperature. Therefore, vapour pressure of a liquid equals the pressure surrounding the liquid. But boiling point elevation is the boiling point of purest liquids increase when we add another compound to it.