2.5.2 Gas Volumes

• Avogadro's Law states that the volume of a gas is directly proportional to the number of moles at constant temperature and pressure.


  True
• Match the temperature and pressure conditions with their descriptions:

  STP ↔️ 273 K and 1 atm

  RTP ↔️ 298 K and 1 atm
• The molar volume at STP is derived from the Ideal Gas Law.

  True
• Avogadro's Law states that the volume of a gas is directly proportional to the number of moles
• What is the volume of 2 moles of a gas at STP?

  44.8 L
• What is the pressure in atmospheres at STP?

  1 atm
• What is the volume of 3 moles of a gas at STP?

  67.2 L
• Avogadro's Law states that the volume of a gas is directly proportional to the number of moles
• What is the Ideal Gas Equation?

  $PV =$$nRT$
• Steps to use the Ideal Gas Equation to solve for an unknown variable

  1️⃣ Rearrange the equation to isolate the unknown

  2️⃣ Plug in the known values

  3️⃣ Calculate the result
• To solve for moles in the Ideal Gas Equation, you can rearrange it as n = \frac{PV}{RT}</latex>.

  True
• The molar volume at STP is 22.4 liters.


  True
• The formula to calculate the number of moles (n) using pressure (P), volume (V), temperature (T), and the ideal gas constant (R) is n = PV / RT
• To calculate moles (n) from volume (V) at STP, the formula is n = V / 22.4
• How many moles are in 44.8 L of oxygen gas at STP?

  2 mol
• At STP, one mole of any gas occupies 22.4 liters.

  True
• At STP, 2 moles of a gas occupy 44.8 liters.

  True
• Match the variable with its meaning in the Ideal Gas Equation:

  P ↔️ Pressure

  V ↔️ Volume

  n ↔️ Number of moles

  T ↔️ Absolute temperature
• The formula to calculate moles from volume at STP is n = V / 22.4.


  True
• The molar volume of a gas at STP is a constant value of 22.4
• The Ideal Gas Equation is PV = nRT
• Molar volume is the volume occupied by one mole of any gas at STP
• What is the temperature in Kelvin at STP?

  273 K
• Molar volume is the volume occupied by one mole of any gas at STP
• Avogadro's Law states that the volume of a gas is directly proportional to the number of moles at constant temperature and pressure.

  True
• The Ideal Gas Equation describes the behavior of gases.


  True
• Avogadro's Law assumes constant temperature and pressure.


  True
• The molar volume of a gas at STP is 22.4 L/mol.
• The value of the ideal gas constant, R, is 0.082057 L·atm/mol·K.
• In the Ideal Gas Equation, the variable P represents the pressure of the gas.
• What are the units of volume in the Ideal Gas Equation?

  Liters
• What mathematical relationship describes the behavior of gases in the Ideal Gas Equation?

  $PV =$$nRT$
• How do you calculate moles given volume at STP?

  n = \frac{V}{22.4}</latex>
• What is the number of moles of the gas calculated using the given values in the example?

  0.405 mol
• Match the condition with its value at STP:

  Molar Volume at STP ↔️ 22.4 L

  Temperature at STP ↔️ 273 K

  Pressure at STP ↔️ 1 atm
• What is the volume occupied by 2 moles of nitrogen gas at STP?

  44.8 L
• What volume would 2 moles of a gas occupy at STP according to Avogadro's Law?

  44.8 L
• What unit is used for temperature in the Ideal Gas Equation?

  Kelvin
• How many moles are in 44.8 L of oxygen gas at STP?

  2 mol
• According to Avogadro's Law, the volume of a gas is directly proportional to the number of moles.