Transcript Mass-Volume Stoichiometry Problems

Mass-Volume
Stoichiometry Problems
In a mass-volume (or volume – mass)
problem, you will be given either the mass or
volume of one substance and asked to
calculate the mass or volume of another
substance.
STOICHIOMETRY
MASS A
VOLUME A
MOL “A”
MASS B
VOLUME B
MOL “B”
Example 1
Calculate the volume (in liters) of oxygen
gas required to react with 50 g of aluminum
at STP.
4Al(s) + 3O2(g)  2Al2O3(s)
Example 2
An automobile airbag inflates when N2 gas
results from the explosive decomposition if
sodium azide (NaN3).
2NaN3(s)  2Na(s) + 3N2(g)
a. Calculate the mass of NaN3 required to
produce 50L of N2 gas at STP.
b. What volume (in L) of N2 gas is produced
when 175g of sodium is formed at STP?