Ideal and Real Gases
Ideal gases obey conditions of the general gas laws under all states of pressure and temperature. Ideal gases are also named perfect gases. The attributes of ideal gases are as follows,
Gas Laws
Gas laws describe the ways in which volume, temperature, pressure, and other conditions correlate when matter is in a gaseous state. The very first observations about the physical properties of gases was made by Robert Boyle in 1662. Later discoveries were made by Charles, Gay-Lussac, Avogadro, and others. Eventually, these observations were combined to produce the ideal gas law.
Gaseous State
It is well known that matter exists in different forms in our surroundings. There are five known states of matter, such as solids, gases, liquids, plasma and Bose-Einstein condensate. The last two are known newly in the recent days. Thus, the detailed forms of matter studied are solids, gases and liquids. The best example of a substance that is present in different states is water. It is solid ice, gaseous vapor or steam and liquid water depending on the temperature and pressure conditions. This is due to the difference in the intermolecular forces and distances. The occurrence of three different phases is due to the difference in the two major forces, the force which tends to tightly hold molecules i.e., forces of attraction and the disruptive forces obtained from the thermal energy of molecules.
![**Problem Statement:**
A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm. What is the molar mass of the unknown compound?
**Answer Choices:**
1. 38.0 g/mol
2. 26.3 g/mol
3. 26.3 g/mol
4. 81.8 g/mol
5. 33.9 g/mol
**Explanation:**
To determine the molar mass of the unknown compound, you will need to use the Ideal Gas Law, which is given by the equation:
\[ PV = nRT \]
Where:
- \(P\) is the pressure in atmospheres (atm)
- \(V\) is the volume in liters (L)
- \(n\) is the number of moles (mol)
- \(R\) is the ideal gas constant \((0.0821 \, \text{L atm} \cdot \text{K}^{-1} \cdot \text{mol}^{-1})\)
- \(T\) is the temperature in Kelvin (K)
1. **Convert the volume from milliliters to liters:**
\[
V = 245 \, \text{mL} \times \frac{1 \, \text{L}}{1000 \, \text{mL}} = 0.245 \, \text{L}
\]
2. **Rearrange the Ideal Gas Law to solve for \(n\):**
\[
n = \frac{PV}{RT}
\]
Substituting the known values:
\[
n = \frac{(1.22 \, \text{atm}) \times (0.245 \, \text{L})}{(0.0821 \, \text{L atm} \cdot \text{K}^{-1} \cdot \text{mol}^{-1}) \times (298 \, \text{K})}
\]
\[
n \approx 0.0122 \, \text{mol}
\]
3. **Determine the molar mass (M) using the mass (m) and the number of moles (n):**
\[
M = \frac{m}{n}
\]
Given the mass](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F10c6e2dc-d615-4613-bf12-6e31522fc631%2F1dbdd80e-beb7-48d8-981e-0416da5af536%2Fuxxpyd_processed.jpeg&w=3840&q=75)
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 2 images
