Moles
Liters
STP and gases
• STP = standard temperature and pressure
• Temperature = 0°C
• Pressure = 1 atm (atmosphere)
• At STP, 1 mol of gas (or 6.02x1023 particles)
always occupies 22.4 L
Moles to Liters
• Convert 0.60 mol SO2 to liters (at STP)
Convert 0.60 mol SO2 to liters (at
STP)
• Start with what you know!
0.60 mol SO2 x 22.4 L SO2
1
1 mol SO2
Convert 0.60 mol SO2 to liters (at
STP)
• Start with what you know!
0.60 mol SO2 x 22.4 L SO2
1
1 mol SO2
Moles cancel out.
0.60 x 22.4 = 13.44 L SO2 = 13 L SO2
Convert 1.25 mol He at STP to L
• Start with what you know, put it over 1
Convert 1.25 mol He at STP to L
• Start with what you know, put it over 1
1.25 mol He x 22.4 L He
1
1 mol He
Do the math, round to sig digits
Convert 1.25 mol He at STP to L
• Start with what you know, put it over 1
1.25 mol He x 22.4 L He
1
1 mol He
Do the math, round to sig digits:
1.25 x 22.4 = 28 L = 28 L He
One more practice...
Convert 3.70 mol N2 at STP to liters
• Start with what you know, put it over one
One more practice...
Convert 3.70 mol N2 at STP to liters
• Start with what you know, put it over one
3.70 mol N2 x 22.4 L N2
1
1 mol N2
Do the math, round to sig digits
One more practice...
Convert 3.70 mol N2 at STP to liters
• Start with what you know, put it over one
3.70 mol N2 x 22.4 L N2
1
1 mol N2
Do the math, round to sig digits:
3.70 x 22.4 = 82.88 = 82.9 L N2
Liters  Moles
• Convert 0.200 L H2 at STP to moles
Convert 0.200 L H2 at STP to moles
0.200 L H2 x 1 mol H2
1
22.4 L H2
Convert 0.200 L H2 at STP to moles
0.200 L H2 x 1 mol H2
1
22.4 L H2
0.200 / 22.4 = 0.0089285 mol
= 0.00893 mol or 8.93 x 10-3 moles H2
Convert 2 liters of CO at STP to
moles
• Start with what you know, put it over 1
Convert 2 liters of CO at STP to
moles
2 L CO x 1 mole CO
1
22.4 L CO
Convert 2 liters of CO at STP to
moles
2 L CO x 1 mole CO
1
22.4 L CO
=0.089285714 rounded to 0.09 moles CO
One more practice:
Convert 0.5 L of Ne at STP to moles
• Start with what you know, put it over 1
One more practice:
Convert 0.5 L of Ne at STP to moles
• Start with what you know, put it over 1
0.5 L Ne x 1 mol Ne
1
22.4 L Ne
Do the math, round to sig digits
One more practice:
Convert 0.5 L of Ne at STP to moles
• Start with what you know, put it over 1
0.5 L Ne x 1 mol Ne
1
22.4 L Ne
Do the math, round to sig digits:
0.5 / 22.4 = 0.0223214 mol Ne = 0.02 mol Ne
Agenda
• We have done all the mole math that there is!
Now you can put it all together and:
• 1. Read pages 297-303. Do questions 24-31 on
page 303 in your notebooks.
• 2. Complete Mole Practice Sheet #3