lecture 10.2b- molar volume & stp
DESCRIPTION
Section 10.2 lecture (part B) for Honors & Prep ChemistryTRANSCRIPT
Bellwork- Mole conversions
1. Gold is currently selling for $23.77 per gram.
a) How much would two moles of gold cost?
b) How many atoms are in two moles of gold?
2. How many grams of Be(NO3)2 would contain 3.2 moles?
The Mole–Volume Relationship
Avogadro’s Law-
Equal volumes of gases at the same temperature and pressure contain equal numbers of particles.
The volume of a gas varies with temperature and pressure.
The volume of a gas varies with temperature and pressure.
Because of these variations, the volume of a gas is usually measured at a standard temperature and pressure.
The volume of a gas varies with temperature and pressure.
Because of these variations, the volume of a gas is usually measured at a standard temperature and pressure.
Standard temperature and pressure (STP) means a temperature of 0°C and a pressure of 1 atm.
At STP, 1 mol of any gas occupies a volume of 22.4 L.
At STP, 1 mol of any gas occupies a volume of 22.4 L.
The quantity 22.4 L is called the molar volume of a gas.
10.7
10.7
Write the given
0.60 mol
10.7
Write the given
0.60 mol
10.7
Write the given
0.60 mol 1 mol
10.7
Write the given
0.60 mol 1 mol22.4L
10.7
Write the given
0.60 mol 1 mol22.4L
Because the ? asks for volume at STP
10.7
Write the given
0.60 mol 1 mol22.4L
Because the ? asks for volume at STP
= 13.4L
How many moles are in 44.8 liters of oxygen gas (O2) at STP?
How many moles are in 44.8 liters of oxygen gas (O2) at STP?
• It doesn’t matter what type of gas we have
How many moles are in 44.8 liters of oxygen gas (O2) at STP?
• It doesn’t matter what type of gas we have
• If a gas is at STP then 1 mole = 22.4L
How many moles are in 44.8 liters of oxygen gas (O2) at STP?
• It doesn’t matter what type of gas we have
• If a gas is at STP then 1 mole = 22.4L
44.8L
How many moles are in 44.8 liters of oxygen gas (O2) at STP?
• It doesn’t matter what type of gas we have
• If a gas is at STP then 1 mole = 22.4L
44.8L
How many moles are in 44.8 liters of oxygen gas (O2) at STP?
• It doesn’t matter what type of gas we have
• If a gas is at STP then 1 mole = 22.4L
44.8L 22.4L
How many moles are in 44.8 liters of oxygen gas (O2) at STP?
• It doesn’t matter what type of gas we have
• If a gas is at STP then 1 mole = 22.4L
44.8L 1 mol22.4L
How many moles are in 44.8 liters of oxygen gas (O2) at STP?
• It doesn’t matter what type of gas we have
• If a gas is at STP then 1 mole = 22.4L
44.8L 1 mol22.4L
= 2 moles
The Mole Road Map
• The Mole Road Map
3. What is the volume of 0.35 mol of oxygen gas at STP?
a. 32 L
b. 64 L
c. 7.8 L
d. 16 L
10.2 Section Quiz.