Name ____________________
CHEM 1004
Homework #9
Spring 2011
Buckley
This homework is due on Tuesday, March 8, at class time. The assignment will be accepted until
the start of class on Wednesday, March 10, with a 20% penalty. Assignments turned in after
class that day will receive no credit, though I will look through them if you want me to.
1. (20 points) Balance each of the following questions. Place a number in front of each
element/compound even if it is a “1”.
____Al (s) +
____Cl2 (g) →
____AlCl3 (s)
____ PbCO3 (s) → ____ PbO (s) + CO2 (g)
____ C7H8O2 (ℓ) + ____ O2 (g) → ____ CO2 (g) + ____ H2O (g)
____ K2O (s) + ____ H2O (ℓ) → ____ KOH (aq)
____ Ca3P2 (s) + ____ H2O (ℓ) → ____ Ca(OH)2 (aq) + ____ PH3 (g)
____ Fe(OH)3 (s) + ____ H2SO4 (aq) → ____ Fe2(SO4)3 (aq) + ____ H2O (ℓ)
____ C8H18 (ℓ) + ____ O2 (g)
→ ____ CO2 (g) + ____ H2O (ℓ)
____ CO (g) + ____ O2 (g) → ____ CO2 (g)
____ N2O5 (g) + ____ H2O (ℓ) →
HNO3 (aq)
____ CH4 (g) + ____ Cl2 (g) → ____ CCl4 (ℓ) + ____ HCl (g)
(Note: When we normally balance equations we do not include the “1” as a coefficient.
However, above I just wanted to be sure you understood there are “1”s in the balanced
equation.
2. (5 points) Consider 5 mol of (NH4)2SO4.
a. How many moles of N atoms are in this quantity?
b. How many moles of H atoms are in this quantity?
c. How many moles of S atoms are in this quantity?
d. How many moles of sulfate ions are in this quantity?
e. How many moles of ammonium ions are in this quantity?