Question

Which of the following has the highest critical temperature?

H2
N2
NH3
H2O

Answer 1

The correct answer is H2O

Step-by-step explanation:

Critical Temperature is the temperature of a substance in its critical state which is the highest temperature at which it is possible to separate substances into two fluid phases (vapor and liquid). At higher temperatures, the gas cannot be liquefied by pressure alone. In the given options water has the highest value of critical temperature as compared to the other given compounds which are H2 = -240 °C, N2= -147 °C and NH3= 132.4 °C.

Answer 2

Hello!

The answer is: H2O

Why?

The critical temperature (also known as the critical point) is the temperature above a vapor or gas can't be liquefied no matter how many pressure can be applied. Every substance has a critical temperature which varies according to the substance/compound nature.

For example, the water has a critical temperature of 373.94 °C, it means that above that temperature the vapor and liquid phases can't be distinct and there is no possible way that the vapor became liquid again no matter how many pressure is applied.

The critical temperature of the given elements/compounds are:

H2 : -240 °C

N2: -147 °C

NH3: 132.4 °C

H2O: 373.94 °C

Have a nice day!