09.10 - Observation: H2 (g) + O2 (g) -> H2O (g) + heat...

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1 Observation: H 2 (g) + O 2 (g) ---> H 2 O (g) + heat Recall: mass is conserved, atoms conserved 2g H 2 (g) + 16g O 2 (g) ---> 18g H 2 O (g) 4g H 2 (g) + 32g O 2 (g) ---> 36g H 2 O (g) 2g H 2 (g) + 32g O 2 (g) ---> 18g H 2 O (g) 4g H 2 (g) + 16g O 2 (g) ---> 18g H 2 O (g) Why? Because the molecule is the fundamental unit. To form 1 molecule water, need 1 molecule hydrogen and 1/2 molecule (proportionally) oxygen. Observation: 2g H 2 (g) + 16g O 2 (g) ---> 18g H 2 O (g) 2g H 2 (g) + 32g O 2 (g) ---> 18g H 2 O (g) 2g H 2 / (2g/mol) ~ 1 mol H 2 ~ 2 mol H atoms 16g O 2 / (32g/mol) ~ 0.5 mol O 2 ~ 1 mol O atoms produce 18g H \ O / (18 g/mol) ~ 1 mol water molecules 2g H 2 / (2g/mol) ~ 1 mol H 2 ~ 2 mol H atoms 32g O 2 / (32g/mol) ~ 1 mol O 2 ~ 2 mol O atoms produce 1 mol water molecules has 2 mol H and 1 mol O The reaction is limited by the number of H atoms>
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2 Stoichiometry A chemistry-specific term that comes from uniqueness of molecular formula and conservation of atoms. The
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09.10 - Observation: H2 (g) + O2 (g) -> H2O (g) + heat...

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