1. Review:
Octane, C8H18 (l), has a density of g/mL at 20oC. A 255 mL sample of C8H18 (l) measured at 20oC reacts completely with 700 g of excess oxygen as represented by the equation below.
2 C8H18 (l) O2 (g)  CO2 (g) H2O (g)
How much oxygen remains after the reaction takes place?

2. Gas Law Stoichiometry: Remember – change it to moles!!!
C2H6 (g) O2 (g)  CO2 (g) H2O (l)
The following reaction is performed at STP. If 2.5 g of ethane is burned, what volume of oxygen gas is required?

3. Gas Law Stoichiometry: Remember – change it to moles!!!
C2H6 (g) O2 (g)  CO2 (g) H2O (l)
If 2.5 g of ethane is burned, what volume of carbon dioxide gas is produced? The CO2 is collected in a balloon at room temperature (27oC) and atmospheric pressure (1 atm).

4. Solution Stoichiometry: Remember – change it to moles!!!
CaCO3 (s) + 2 HCl (aq)  CaCl2 + H2O + CO2
What mass of calcium carbonate is needed to react completely with 25 mL of 0.75 M HCl?

5. Solution Stoichiometry: Remember – change it to moles!!!
On Your Own:
__ Pb(NO3)2 + __ NaI  __ PbI2 + __ NaNO3
How many milliliters of 0.10 M Pb(NO3)2 are required to react with 75 mL of 0.20 M NaI?