Questions: Question 30 of 30 Which of the following has the lowest freezing point? A H2O B N2 C SO2 D H2 E CO2

Transcript text: Question 30 of 30 Which of the following has the lowest freezing point? A $\mathrm{H}_{2} \mathrm{O}$ B $\mathrm{N}_{2}$ C $\mathrm{SO}_{2}$ $D$ $\mathrm{H}_{2}$ E $\mathrm{CO}_{2}$

Solution

Solution Steps

Step 1: Understanding Freezing Points

The freezing point of a substance is the temperature at which it changes from a liquid to a solid. Different substances have different freezing points based on their molecular structure and intermolecular forces.

Step 2: Analyzing the Substances

Let's consider the substances given in the options:

A. $\mathrm{H}_{2} \mathrm{O}$ (Water): Freezes at 0°C (273.15 K).
B. $\mathrm{N}_{2}$ (Nitrogen): Freezes at approximately -210°C (63.15 K).
C. $\mathrm{SO}_{2}$ (Sulfur Dioxide): Freezes at approximately -72°C (201.15 K).
D. $\mathrm{H}_{2}$ (Hydrogen): Freezes at approximately -259°C (14.01 K).
E. $\mathrm{CO}_{2}$ (Carbon Dioxide): Sublimates at -78.5°C (194.65 K) under standard atmospheric pressure, but its freezing point under higher pressure is around -56.6°C (216.55 K).

Step 3: Identifying the Lowest Freezing Point

From the above analysis, we can see that hydrogen ($\mathrm{H}_{2}$) has the lowest freezing point at approximately -259°C (14.01 K).