Common questions about molar volume and Avogadro's constant (22.4 L/mol)

🧪 Quick Study Guide

• ⚛️ The molar volume of a gas at Standard Temperature and Pressure (STP) is 22.4 L/mol.
• 🌡️ STP conditions are defined as 0°C (273.15 K) and 1 atm pressure.
• 🔢 Avogadro's constant ($N_A$) is $6.022 \times 10^{23}$ entities per mole.
• ⚖️ Molar mass (M) is the mass of one mole of a substance, expressed in grams per mole (g/mol).
• ⚗️ The ideal gas law is $PV = nRT$, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature.
• 💡 Remember that $n = \frac{mass}{Molar\, mass}$

Practice Quiz

1. What is the molar volume of an ideal gas at STP?

   1. A) 11.2 L/mol
   2. B) 22.4 L/mol
   3. C) 44.8 L/mol
   4. D) 2.24 L/mol

2. Avogadro's constant represents the number of:

   1. A) Grams in a mole
   2. B) Liters in a mole
   3. C) Particles in a mole
   4. D) Moles in a liter

3. Which of the following conditions defines Standard Temperature and Pressure (STP)?

   1. A) 25°C and 1 atm
   2. B) 0°C and 1 atm
   3. C) 100°C and 1 atm
   4. D) 0°C and 0 atm

4. If you have 44.8 L of an ideal gas at STP, how many moles of gas do you have?

   1. A) 0.5 moles
   2. B) 1 mole
   3. C) 2 moles
   4. D) 4 moles

5. What is the value of the ideal gas constant (R) when using units of L·atm/(mol·K)?

   1. A) 0.0821 L·atm/(mol·K)
   2. B) 8.314 L·atm/(mol·K)
   3. C) 1.987 L·atm/(mol·K)
   4. D) 62.36 L·atm/(mol·K)

6. How many molecules are present in 1 mole of a substance?

   1. A) $3.011 \times 10^{23}$
   2. B) $1.2044 \times 10^{24}$
   3. C) $6.022 \times 10^{23}$
   4. D) $2.0 \times 10^{23}$

7. What volume will 2 moles of an ideal gas occupy at STP?

   1. A) 11.2 L
   2. B) 22.4 L
   3. C) 44.8 L
   4. D) 67.2 L