Chapter 13-3:Gas Stoichiometry• Remember that molar volume 1 mole=22.4 L for all gases at

STP.• Always write your known and unknown.• Draw 2 blanks then an equal and an answer blank.• ---------------- x------------------- = -----------------• Balance the equation involved with the problem.• Write the known values in the 1st numerator.• Write the unknown units in the 2nd numerator and answer

blank.• Drag the known units to the second denominator.• Write a valid conversion factor in the second blank.• Solve the math and write an answer in the last numerator

with correct sig. figs. and units.

Types of Stoichiometry Problems

• Mole/Mole• Mole/volume• Volume/mole• Volume/mass• Mass/volume

• See example problems

Example Gas Stoichiometry

• How many liters of gaseous water are produced when 80.0 L of oxygen are reacted with excess hydrogen?

• 2H2 + O2 2H2O

• 80.0 L O2 x 44.8 L H2O = 160. LH2O 1 22.4 L O2