Question

In: Chemistry

For which of the following reactions is ?H?rxn equal to ?H?f of the product(s)? You do...

For which of the following reactions is ?H?rxn equal to ?H?f of the product(s)?

You do not need to look up any values to answer this question. Check all that apply.

SO(g)+12O2(g)?SO2(g)

2Na(s)+F2(g)?2NaF(s)

Na(s)+12F2(g)?NaF(s)

S(s)+O2(g)?SO2(g)

Na(s)+12F2(l)?NaF(s)

SO3(g)?12O2(g)+SO2(g)

Solutions

Expert Solution

1) SO(g)+1/2O2(g)→SO2(g)

ΔH∘rxn = ΔH∘f(SO2) - (ΔH∘fSO + 0.5ΔH∘fO2)

ΔH∘rxn = ΔH∘f(SO2) - (ΔH∘fSO)

so here ΔH∘rxn is not equal to ΔH∘f of the product(s)

2) 2Na(s)+F2(g)→2NaF(s)

ΔH∘rxn = 2 X ΔH∘f (NaF) - (2 X ΔH∘f (Na) + ΔH∘f F2)

ΔH∘f Na = ΔH∘f F2 = 0

Therefore

ΔH∘rxn = 2 X ΔH∘f (NaF)

Hence ΔH∘rxn is not equal to ΔH∘f of the product(s)

3) Na(s)+1/2F2(g)→NaF(s)

ΔH∘rxn = ΔH∘f (NaF) - ( ΔH∘f (Na) + 0.5ΔH∘f F2)

ΔH∘f (Na) = ΔH∘f F2 = 0

ΔH∘rxn = ΔH∘f (NaF)

Hence ΔH∘rxn equal to ΔH∘f of the product(s)

4) S(s)+O2(g)→SO2(g)

ΔH∘rxn = ΔH∘f (SO2) - ( ΔH∘f (S) + ΔH∘f O2)

ΔH∘f (S) = ΔH∘f O2 = 0

ΔH∘rxn = ΔH∘f (SO2)

Hence ΔH∘rxn equal to ΔH∘f of the product(s)

5) Na(s)+1/2F2(l)→NaF(s)

ΔH∘rxn = ΔH∘f (NaF) - ( ΔH∘f (Na) + 0.5ΔH∘f F2(l))

ΔH∘rxn = ΔH∘f (NaF) - ( 0.5ΔH∘f F2(l))

hence ΔH∘rxn is not equal to ΔH∘f of the product(s)

6) SO3(g)→1/2O2(g)+SO2(g)

ΔH∘rxn = (ΔH∘f SO2 + 0.5ΔH∘f O2) -( ΔH∘f (SO3)

ΔH∘rxn = (ΔH∘f SO2 ) -( ΔH∘f (SO3)

Hence ΔH∘rxn is not equal to ΔH∘f of the product(s)


Related Solutions

For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? You do...
For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? You do not need to look up any values to answer this question. Check all that apply. Hints Check all that apply. S(s)+O2(g)→SO2(g) SO(g)+12O2(g)→SO2(g) Li(s)+12Cl2(l)→LiCl(s) Li(s)+12Cl2(g)→LiCl(s) SO3(g)→12O2(g)+SO2(g) 2Li(s)+Cl2(g)→2LiCl(s)
Part A: For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)?...
Part A: For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? You do not need to look up any values to answer this question. 2Li(s)+F2(g)→2LiF(s) S(s)+O2(g)→SO2(g) Li(s)+12F2(g)→LiF(s) SO(g)+12O2(g)→SO2(g) SO3(g)→12O2(g)+SO2(g) Li(s)+12F2(l)→LiF(s) Part B: The combustion of propane, C3H8, occurs via the reaction C3H8(g)+5O2(g)→3CO2(g)+4H2O(g) with heat of formation values given by the following table: Substance ΔH∘f (kJ/mol) C3H8 (g) -104.7 CO2(g) −393.5 H2O(g) −241.8 Calculate the enthalpy for the combustion of 1 mole of propane.
For which of the following reactions is Δ H ∘ rxn equal to Δ H ∘...
For which of the following reactions is Δ H ∘ rxn equal to Δ H ∘ f of the product(s)? You do not need to look up any values to answer this question. Check all that apply. Check all that apply. BaC O 3 (s)→BaO(s)+C O 2 (g) C(s,graphite)+ O 2 (g)→C O 2 (g) CO(g)+ 1 2 O 2 (g)→C O 2 (g) 2Na(s)+ F 2 (g)→2NaF(s) Na(s)+ 1 2 F 2 (l)→NaF(s) Na(s)+ 1 2 F 2 (g)→NaF(s)...
For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? a) Li(s)+12F2(l)→LiF(s)...
For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? a) Li(s)+12F2(l)→LiF(s) b) H2(g)+12O2(g)→H2O(g) c)2H2(g)+O2(g)→2H2O(g) d) 2Li(s)+F2(g)→2LiF(s) e) Li(s)+12F2(g)→LiF(s) f) H2O2(g)→12O2(g)+H2O(g)
[2] Calculate ∆H°rxn and ∆S°rxn for the following reaction and decide in which direction each of...
[2] Calculate ∆H°rxn and ∆S°rxn for the following reaction and decide in which direction each of these factors will drive the reaction. N2(g) + 3 H2(g) → 2 NH3(g)
Given the values of Δ H ∘ rxn , Δ S ∘ rxn , and T...
Given the values of Δ H ∘ rxn , Δ S ∘ rxn , and T below, determine Δ S univ(J/K) (for each part ) . A)ΔH∘rxn= 121 kJ , ΔS∘rxn=− 248 J/K , T= 297 K , B)ΔH∘rxn=− 121 kJ , ΔS∘rxn= 248 J/K , T= 297 K C)ΔH∘rxn=− 121 kJ , ΔS∘rxn=− 248 J/K , T= 297K. D)ΔH∘rxn=− 121 kJ , ΔS∘rxn=− 248 J/K , T= 546 K
Use delta H f and S to calculate delta G rxn (delta g not sys) at...
Use delta H f and S to calculate delta G rxn (delta g not sys) at 25 C for the reaction below: 4KClO3 (s) --> 4KClO4 (s) + KCL (s) Delta H not f KCLO3 = -397.7 kj/mol; KCLO4 = -432.8 kJ/mol; KCL = -436.7 kJ/mol S KCLO3 = 143.1 kJ/mol ; KCLO4= 151.0 kJ/mol; KCL = 82.6 kJ/mol
For each reaction, calculate Δ H ∘ rxn , Δ S ∘ rxn , and Δ...
For each reaction, calculate Δ H ∘ rxn , Δ S ∘ rxn , and Δ G rxn at 29 ∘ C . A) N2O4(g)→2NO2(g) B) NH4Cl(s)→HCl(g)+NH3(g) C) 3H2(g)+Fe2O3(s)→2Fe(s)+3H2O(g) D) N2(g)+3H2(g)→2NH3(g)
Given the following reactions of nitrosyl chloride (NOCl), calculate the ∆H°rxn, in kilojoules per mole, for...
Given the following reactions of nitrosyl chloride (NOCl), calculate the ∆H°rxn, in kilojoules per mole, for the third reaction. Enter your answer to the tenths place. Don’t forget the sign! 2NOCl(g) ⟶ 2NO(g) + Cl2 (g) ΔHrxn ° = +79.2 kJ mol ⁄ NOCl(g) + 1 2 O2 (g) ⟶ NO2Cl(g) ΔHrxn ° = -39.1 kJ mol ⁄ 2NO(g) + Cl2 (g) + O2 (g) ⟶ 2NO2Cl(g)
Which of the following reactions would you predict to be spontaneous at all temperatures (assuming ΔH°­rxn...
Which of the following reactions would you predict to be spontaneous at all temperatures (assuming ΔH°­rxn does not change significantly with temperature)? H2S(g) + 2O2(g) → H2SO4(l) ΔH°­rxn = –793 kJ/mol 2Ag(s) + 3N2(g) → 2AgN3(s) ΔH°­rxn = +1240 kJ/mol C6H6(l) + 3H2(g) → C6H12(l) ΔH°­rxn = –207 kJ/mol Na2CO3(s) + 2HCl(aq) → 2NaCl(aq) + H2O(l) + CO2(g) ΔH°­rxn = –834 kJ/mol CaCO3(s) → CaO(s) + O2(g) ΔH°­rxn = +179 kJ/mol
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT