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Study the reactions for the formation of compounds from their elements. I. C(s) + O2(g) → CO2(g) ΔHf = −394 kJ II. H2(g) + 12 1 2 O2(g) → H2O(l) ΔHf = −242 kJ III. 2C(s) + 3H2(g) → C2H6(g) ΔH =−84 kJ The combustion of C2H6 is shown by the following equation: C2H6(g) + 72 7 2 O2(g) → 2CO2(g) + 3H2O(l) Which option correctly gives the enthalpy of combustion of 0.2 moles of C2H6(g)?

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Related questions

2. What is the standard enthalpy of formation (∆f H◦ ) for ethane (C2H6) at 25 ◦C? The following standard rection enthalpies at 25 ◦C are known:

(1) C(s, graphite) + O2(g) → CO2(g), ∆r H ◦ = −393.5 kJ mol−1

(2) H2(g) + 1 2 O2(g) → H2O(l), ∆r H ◦ = −285.9 kJ mol−1

(3) C2H6(g) + 31 2 O2(g) → 2CO2(g) + 3H2O(l), ∆r H ◦ = −1560.1 kJ mol−1

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C2H5OH(l) + 3 O2(g) ® 2CO2(g) + 3 H2O)

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Equations DHf (kJ/mol)

C(s) + O2(g) ®CO2(g) -394

H2(g) + ½ O2(g) ®H2O(?) -285

2C(s) + 3 H2(g) + ½ O2(g) ® C2H5OH(?) -278

H2(g) + ½ O2(g) ®H2O(g) -242


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