1. 02/17 Warm-Up U8-4 Add to U8-4 Unit 8 Warm-Ups
You may add today’s Warm-Up to the same page as the previous one or write it on a new sheet of paper
Date the assignment: 02/17/2014
Title the assignment: Equations by Mass
Number the page in the upper corner: U8-4
Write the question and then write your answer.

2. ___ C3H8 + ___ O2 → ___ CO2 + ___ H2O
U8-4
Equations by Mass
Balance the equation below:
___ C3H8 + ___ O2 → ___ CO2 + ___ H2O
Interpret the equation in terms of mass.
Show that the Law of Conservation of Mass has been observed.

3. ___ C3H8 + ___ O2 → ___ CO2 + ___ H2O
U8-4
Equations by Mass
Balance the equation below:
___ C3H8 + ___ O2 → ___ CO2 + ___ H2O
Interpret the equation in terms of mass.
(1) 5 3 4
44.0 g/mol
32.0 g/mol
44.0 g/mol
18.0 g/mol
(1 mol C3H8)(44.0 g/mol C3H8)
+ (5 mol O2)(32.0 g/mol O2)
→ (3 mol CO2)(44.0 g/mol CO2)
+ (4 mol H2O)(18.0 g/mol H2O)
44.0 g C3H g O2 → g CO g H2O

4. 204.0 g reactants = 204.0 g products
Equations by Mass
___ C3H8 + ___ O2 → ___ CO2 + ___ H2O
Show that the Law of Conservation of Mass has been observed. 5 3 4
44.0 g C3H g O2 → g CO g H2O
44.0 g C3H g O2 = g reactants
132.0 g CO g H2O = g products
204.0 g reactants = g products