Homework Answers
- Entropy of a system increases when the number of moles of products is more than the number of moles of the reactants.
- Also, entropy increases when solid is converted into liquid or liquid is converted into gas.
- a) Here, entropy increases. This is because one mole of reactant gives two moles of the product.
- b) Here, entropy decreases as 3 moles of reactants gives 2 moles of products.
- c) Here, entropy increases as 1 mole of reactant gives 2 moles of products.
- d) Here, entropy decreases as 2 moles of reactants gives only 1 mole of product.
- e) Here, entropy increases as 2 moles of reactants gives 3 moles of products.
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Based on a simple inspection of the following reactions, state whether entropy would increase (1) or...
B. Calculate the standard entropy change for the reaction 2Na(s)+Cl2(g)?2NaCl(s) using the data from the following t...
B. Calculate the standard entropy change for the reaction
2Na(s)+Cl2(g)?2NaCl(s)
using the data from the following table:
Substance
?H?f (kJ/mol)
?G?f (kJ/mol)
S? [J/(K?mol)]
Na(s)
0.00
0.00
51.30
Cl2(g)
0.00
0.00
223.1
NaCl(s)
-411.0
-384.0
72.10
Express your answer to four significant figures and include the
appropriate units.
Part A Predict the sign of the entropy change, AS°,for each of the reaction displayed. Drag the appropriate items to their respective bins. Ag+(aq) + Cl-(aq) → AgCl(s) | | Ca(OH)2(s) →...
Predict the products of the following reactions and balance the chemical equations. 1. Synthesis Reactions a)...
Predict the products of the following reactions and balance the chemical equations. 1. Synthesis Reactions a) 2Na(s) + Cl2(g) → 2NaCl (s) b) 3Mg(s) + N2(g) → Mg3N2 (8) 2. Decomposition Reactions a) 2HgO(s) → 2Hg (s)+ O2(g) b)Li2O(s)2Li (g)+ 0-2 (g) 3. Single Displacement Reactions a) Al(s) + Pb(NO3)2 (aq) → Al(NO3)2 + Pb b) Ca(s) + HNO3(aq) → 4. Double Displacement Reactions Remember to include state symbols to show if a precipitate forms. a) CaCl2(aq) +_ Li2SO4(aq) →...
Predict the sign of the entropy change, ΔS∘, for each of the reaction displayed. Drag the appropriate items to their r...
Predict the sign of the entropy change, ΔS∘, for each of the reaction displayed. Drag the appropriate items to their respective bins. Pb2+(aq)+2Cl−(aq)→PbCl2(s) CaCO3(s)→CaO(s)+CO2(g) 2NH3(g)→N2(g)+3H2(g) 2Mg(s)+O2(g)→2MgO(s) C5H12(g)+8O2(g)→5CO2(g)+6H2O(g) H2O(l)→H2O(g) Positive Negative
Short Answer: (4 points each) 1.) Predict whether the entropy change is positive or negative for...
Short Answer: (4 points each) 1.) Predict whether the entropy change is positive or negative for each of the following reactions. GIVE YOUR REASON FOR YOUR PREDICTIONS a) 2KC1O4(s) → 2KCIO3() + O2(8) b) H2O → H2O) c) 2Na(3) + H2O → 2NaOH(aq) + H2() d) N2(g) → 2N) 2.) State whether the sign of the entropy change expected for each of the following processes will be positive or negative, and EXPLAIN YOUR PREDICTIONS. a) PC130) + Cl2(e) → PCls(s)...
Part A Predict the sign of the entropy change, ΔS∘, for each of the reaction displayed. Drag the appropriate items to...
Part APredict the sign of the entropy change, ΔS∘, for each of the reaction displayed.Drag the appropriate items to their respective bins.Ag+(aq)+Cl−(aq)→AgCl(s)2KClO3(s)→2KCl(s)+3O2(g)2N2O(g)→2N2(g)+O2(g)2Mg(s)+O2(g)→2MgO(s)C7H16(g)+11O2(g)→7CO2(g)+8H2O(g)H2O(l)→H2O(g)Part BCalculate the standard entropy change for the reaction2Mg(s)+O2(g)→2MgO(s)using the data from the following table:SubstanceΔH∘f (kJ/mol)ΔG∘f (kJ/mol)S∘ [J/(K⋅mol)]Mg(s)0.000.0032.70O2(g)0.000.00205.0MgO(s)-602.0-569.627.00Express your answer to four significant figures and include the appropriate units.ΔS∘ =
Which of the reactions are exothermic? 2Mg(s)+O2(g)⟶2MgO(s)+heat2Mg(s)+O2(g)⟶2MgO(s)+heat NH3(g)+HCl(g)⟶NH4Cl(s)+heatNH3(g)+HCl(g)⟶NH4Cl(s)+heat AgCl(s)+heat⟶Ag+(aq)+Cl−(aq)AgCl(s)+heat⟶Ag+(aq)+Cl−(aq) 2Fe2O3(s)+3C(s)+heat⟶4Fe(s)+3CO2(g)2Fe2O3(s)+3C(s)+h
Which of the reactions are exothermic? 2Mg(s)+O2(g)⟶2MgO(s)+heat2Mg(s)+O2(g)⟶2MgO(s)+heat NH3(g)+HCl(g)⟶NH4Cl(s)+heatNH3(g)+HCl(g)⟶NH4Cl(s)+heat AgCl(s)+heat⟶Ag+(aq)+Cl−(aq)AgCl(s)+heat⟶Ag+(aq)+Cl−(aq) 2Fe2O3(s)+3C(s)+heat⟶4Fe(s)+3CO2(g)2Fe2O3(s)+3C(s)+heat⟶4Fe(s)+3CO2(g) C(graphite)+O2(g)⟶CO2(g)+heatC(graphite)+O2(g)⟶CO2(g)+heat CH4(g)+2O2(g)⟶CO2(g)+2H2O(l)+heat
Does the entropy of the system increase or decrease for the following reactions? (1) Ba2+(aq) +...
Does the entropy of the system increase or decrease for the following reactions? (1) Ba2+(aq) + S042"(aq) -- BaSO4(s) (11) 2 Na(s) + 2 H2O(1) 2 NaOH(aq) + H2(g) (III) 2 C2H6(g) + 7 O2(g) - 4CO2(g) + 6 H2O(1)
1. For the following processes indicate if there is a decrease, no change, or increase in...
1. For the following processes indicate if there is a decrease, no change, or increase in the entropy of the system (5 points) a) Hg() → Hg(s) b) CO2(s) → CO2(g) c) 2Na(s) + Cl2(g) → 2NaCl(s) d) 2 SO2(g) + O2(g) → 2503(g)
sectio direct THE The is inc plus surrc T 4 Predict and explain the changes in...
sectio direct THE The is inc plus surrc T 4 Predict and explain the changes in entropy for the following reactions: a N2(g) + 3H2(g) + 2NH3(g) b 2Mg(s) + O2(g) → 2MgO(s) c CaCO3(s) CaO(s) + CO2(g) d H2O(1) H2O(g) i
3. In the following reactions, identify which of the elements are oxidized and which are reduced...
3. In the following reactions, identify which of the elements are oxidized and which are reduced and enter the name of the element on the line. (3 points for each equation, 9 points total) a. 2Ca(s) + O2(g) - Cal is oxidized is reduced b. MnO2 (aq) + 4 HBr(aq) -Bra(l) + MnBr2 (aq) + 2 H2O(0) is oxidized is reduced C. Cl2(g) +2 NaBr(ag) 2NaCl(aq) + Br2 () (Here Cl is chlorine) is oxidized is reduced
B. Calculate the standard entropy change for the reaction
2Na(s)+Cl2(g)?2NaCl(s)
using the data from the following table:
Substance
?H?f (kJ/mol)
?G?f (kJ/mol)
S? [J/(K?mol)]
Na(s)
0.00
0.00
51.30
Cl2(g)
0.00
0.00
223.1
NaCl(s)
-411.0
-384.0
72.10
Express your answer to four significant figures and include the
appropriate units.
Part A Predict the sign of the entropy change, AS°,for each of the reaction displayed. Drag the appropriate items to their respective bins. Ag+(aq) + Cl-(aq) → AgCl(s) | | Ca(OH)2(s) →...
Predict the products of the following reactions and balance the chemical equations. 1. Synthesis Reactions a) 2Na(s) + Cl2(g) → 2NaCl (s) b) 3Mg(s) + N2(g) → Mg3N2 (8) 2. Decomposition Reactions a) 2HgO(s) → 2Hg (s)+ O2(g) b)Li2O(s)2Li (g)+ 0-2 (g) 3. Single Displacement Reactions a) Al(s) + Pb(NO3)2 (aq) → Al(NO3)2 + Pb b) Ca(s) + HNO3(aq) → 4. Double Displacement Reactions Remember to include state symbols to show if a precipitate forms. a) CaCl2(aq) +_ Li2SO4(aq) →...
Short Answer: (4 points each) 1.) Predict whether the entropy change is positive or negative for each of the following reactions. GIVE YOUR REASON FOR YOUR PREDICTIONS a) 2KC1O4(s) → 2KCIO3() + O2(8) b) H2O → H2O) c) 2Na(3) + H2O → 2NaOH(aq) + H2() d) N2(g) → 2N) 2.) State whether the sign of the entropy change expected for each of the following processes will be positive or negative, and EXPLAIN YOUR PREDICTIONS. a) PC130) + Cl2(e) → PCls(s)...
Does the entropy of the system increase or decrease for the following reactions? (1) Ba2+(aq) + S042"(aq) -- BaSO4(s) (11) 2 Na(s) + 2 H2O(1) 2 NaOH(aq) + H2(g) (III) 2 C2H6(g) + 7 O2(g) - 4CO2(g) + 6 H2O(1)
1. For the following processes indicate if there is a decrease, no change, or increase in the entropy of the system (5 points) a) Hg() → Hg(s) b) CO2(s) → CO2(g) c) 2Na(s) + Cl2(g) → 2NaCl(s) d) 2 SO2(g) + O2(g) → 2503(g)
sectio direct THE The is inc plus surrc T 4 Predict and explain the changes in entropy for the following reactions: a N2(g) + 3H2(g) + 2NH3(g) b 2Mg(s) + O2(g) → 2MgO(s) c CaCO3(s) CaO(s) + CO2(g) d H2O(1) H2O(g) i
3. In the following reactions, identify which of the elements are oxidized and which are reduced and enter the name of the element on the line. (3 points for each equation, 9 points total) a. 2Ca(s) + O2(g) - Cal is oxidized is reduced b. MnO2 (aq) + 4 HBr(aq) -Bra(l) + MnBr2 (aq) + 2 H2O(0) is oxidized is reduced C. Cl2(g) +2 NaBr(ag) 2NaCl(aq) + Br2 () (Here Cl is chlorine) is oxidized is reduced
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