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```Mass of Matter:
Hydrogen
H
1 amu
Carbon
C
12 amu
Oxygen
O
16 amu
Name:
Per:
amu = atomic mass units
What is the mass of O2? _______________
What is the mass of CO2? ______________
What is the mass of H2O? ______________
What is the mass of C6H12O6? ______________
Where did the mass come from?
6CO2
6O2
+ 6H2 O

C6H12O6 +
In a glucose molecule where did the Carbons come from? ___________________
In a glucose molecule where did the Hydrogens come from? ___________________
In a glucose molecule where did the Oxygens (not water) come from? ___________________
What percentage of the mass of a glucose molecule came from CO2?
Step 1: 6 carbons = 72 amu
6 oxygens = 96 amu
Step 2: 72 + 96 = 168 amu
Step 3: 168/180 = 0.93
0.93*100 = ___
What percentage of the mass of a glucose molecule came from H2O? Show your work!
Where does the majority of the biomass of a plant come from? _________________
1. Three students are discussing the role of water and soil in plant growth:
Which student has the best understanding of the plant’s use of soil? _________________________