Chapter 11 Stoichiometry. The study of quantitative relationships between the amounts of reactants...
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Transcript of Chapter 11 Stoichiometry. The study of quantitative relationships between the amounts of reactants...
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Chapter 11Stoichiometry
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Stoichiometry
• The study of quantitative relationships between the amounts of reactants used and amounts of products formed by a chemical reaction
• Law of Conservation of Mass
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How Much?
• If you were making cookies, you would need the right amount of each ingredient to get the two dozen cookies the recipe makes.
• When performing a chemical reaction it is important to know how much of each reactant is needed to get the desired amount of product(s).
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Balanced Equations
• The first step in determining anything in stoichiometry is balancing the chemical equation – Let’s Review!
N2 + H2 → NH33 2
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Practice
1. CH4 + O2 → CO2 + H2O
2. NaOH + CaBr2 → Ca(OH)2 + NaBr
3. H2 + Cl2 → HCl
4. Li + H2O → LiOH + H2
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Types of Relationships
• Particle to Particle• Mole to Mole• Mass to Mass
C3H8(g) + 5O2(g)→ 3CO2(g)+ 4H2O(g)
One molecule of propane gas reacts with five molecules of oxygen gas to form three molecules of carbon dioxide gas and four molecules of water vapor.
One mole of propane gas reacts with five moles of oxygen gas to form three moles of carbon dioxide gas and four moles of water vapor.
44.10 g of propane gas reacts with 159.99 g of oxygen gas to form 132.03 g of carbon dioxide gas and 72.06 g of water vapor.
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Practice
5. 2H2O(g) → 2H2(g)+ O2(g)
6. 2NaCl(aq) + MgBr2(aq) → MgCl2(s)+ 2NaBr(aq)
7. CaO(s) + CO2(g) → CaCO3(s)
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Mole Ratio
• The ratio between the numbers of moles of any two substances in a balanced chemical equation. Taken from the coefficients of the balanced equation.
2K(s) + Br2(l) → 2KBr(s)
2 mol K 2 mol K1 mol Br2 2 mol KBr2 mol KBr 2 mol KBr1 mol Br2 2 mol Br21 mol Br2 1 mol Br2
2 mol K 2 mol KBr
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Mole Ratio
• For reactions with more reactants and products there are more mole ratios
BaS(aq) + 2KOH(aq) → Ba(OH)2 + K2S
1 mol BaS 1 mol BaS 1 mol BaS2 mol KOH 1 mol Ba(OH)2 1 mol K2S
2 mol KOH 2 mol KOH 2 mol KOH1 mol BaS 1 mol Ba(OH)2 1 mol K2S
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Practice
8. H2 + Cl2 → HCl
9. H2O → H2 + O2
10. C2H10 + O2 → CO2 + H2O
11. LiOH + CaBR → Ca(OH)2 + LiBr
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Mole to Mole Conversions
N2 + 3H2 → 2NH3
• If we have one mole of nitrogen gas, we need three moles of hydrogen gas in order to produce two moles of ammonia.
• What if we have 0.012 mol of nitrogen gas?
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Mole to Mole Conversions
N2 + 3H2 → 2NH3
• What if we have 0.012 mol of nitrogen gas?• Use mole ratios
3 mol H2
1 mol N2
2 mol NH3
1 mol N2
0.012 mol N2 × = 0.036 mol H2
0.012 mol N2 × = 0.024 mol H2
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Practice
12. 0.6 mol hydrogen gas
H2 + Cl2 → HCl
13. 1.45 mol oxygen gas
C2H10 + O2 → CO2 + H2O
14. 1.32 mol hydrogen gas
H2O → H2 + O2
15. 0.24 mol lithium hydroxide
LiOH + CaBr2 → Ca(OH)2 + LiBr
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N2(g) + 3H2(g) → 2NH3(g)• What if we have 5.20 mol of nitrogen gas? How
many grams of ammonia are produced in an excess of hydrogen gas?
• Use mole ratios, then molar mass2 mol NH3
1 mol N2
Mole to Mass Conversions
5.20 mol N2 = 15.6 mol NH3×
15.6 mol NH3 17.03 g1 mol NH3
× = 266 g NH3
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4Al(s) + 3O2(g) → 2Al2O3(s)• What if we have 0.42 mol of oxygen gas? How many
grams of aluminum oxide are produced in an excess of aluminum solid?
• Use mole ratios, then molar mass2 mol Al2O3
3 mol O2
Mole to Mass Conversions
0.42 mol O2 = 0.28 mol Al2O3×
0.28 mol Al2O3 101.96 g1 mol Al2O3
× = 29 g Al2O3
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Practice
16. 0.6 mol chlorine gas
Na(s) + Cl2(g) → NaCl(s)
17. 12 mol oxygen gas
P(s) + O2(g) → P2O5(s)
18. 3.05 mol oxygen gas
CH4(g) + O2(g) → CO2(g) + H2O(g)
19. 0.96 mol sodium bromide
NaBr(s) + CaF2(s) → CaBr2(s) + NaF(s)
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N2(g) + 3H2(g) → 2NH3(g)• What if we have 27 g of nitrogen gas? How many grams of
ammonia are produced in an excess of hydrogen gas?• Use molar mass, then mole ratios, then molar mass
2 mol NH3
1 mol N2
Mass to Mass Conversions
0.96 mol N2 = 1.92 mol NH3×
1.92 mol NH3 17.03 g1 mol NH3
× = 33 g NH3
1 mol N2
28.01 g N2
27 g N2 = 0.96 mol N2×
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4Al(s) + 3O2(g) → 2Al2O3(s)• What if we have 14.3 g of oxygen gas? How many grams of
aluminum oxide are produced in an excess of aluminum solid?• Use molar mass, mole ratios, then molar mass
2 mol Al2O3
3 mol O2
Mass to Mass Conversions
0.447 mol O2 = 0.298 mol Al2O3×
0.298 mol Al2O3 101.96 g1 mol Al2O3
× = 30.4 g Al2O3
1 mol O2
32.00 g O2
14.3 g O2 = 0.447 mol O2×
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Practice
20. 46 g chlorine gas
Na(s) + Cl2(g) → NaCl(s)
21. 31.7 g oxygen gas
P(s) + O2(g) → P2O5(s)
22. 3.05 g oxygen gas
CH4(g) + O2(g) → CO2(g) + H2O(g)
23. 6.41 g sodium bromide
NaBr(s) + CaF2(s) → CaBr2(s) + NaF(s)
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