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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 Show your work! 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? _________________________ Use evidence to support your answer!