1. Molar Volume

2. Volume The amount of space that an object takes up
A solid’s or liquid’s volume is determined by the size and spacing of its particles
At a higher temperature, particles are moving faster, hitting each other and bouncing further apart
Volume is greater at higher temperatures

3. Molar Volume Mass of a mole of substance is called:
Molar Mass – Dynamic Quantity
Volume of a mole of substance is called:
Molar Volume – Static Quantity

4. Molar Gas Volume Avogadro’s Hypothesis
Equal volumes of different gases, measured the same temperature and pressure, have equal numbers of particles.
Standard Temperature & Pressure (STP)
0oC
101.3 kPa = 1 atm

5. Molar Gas Volume The molar volume of any gas at STP is 22.4L.
Conversion Factor
1 mol = 22.4 STP

6. What is the volume of 1.3 mol of NO2 at STP?
1.3 mol NO2 x _22.4 L___
1 mol NO2
= 29 L

7. What volume of oxygen gas at STP contains 2.33 mol of O2?
2.33 mol O2 x _22.4 L___
1 mol O2
= 52.2 L

8. Natural gas is used to heat many homes
Natural gas is used to heat many homes. It consists primarily of methane, CH4. What is the mass of 8.9 L of CH4 at STP?
Steps: L CH4 → mol CH4 → mass CH4
8.9 L CH4 x 1 mol CH4 x g CH4
22.4 L CH mol CH4
= 6.4 g