CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g) Calculate ΔH for the reaction using the...

Question

Question

CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

Calculate ΔH for the reaction using the bond enthalpies given.

C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(g)

Calculate the overall enthalpy change for this reaction using the bond enthalpies given.

Answer 1

Answer #1

CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

ΔH =ΔH⁰_f_products –ΔH⁰_f_reactants

ΔH = [(ΔH⁰_f_CO2(g) )+ (2 x ΔH⁰_f_{H2O (g)} )]- [( ΔH⁰_f_CH4(g) )+ (2 x ΔH⁰_f_{O2 (g)} )]

= [ −393.5 +(2x( −241.8 ))]-[ −74.8 +(2x(0.0))]

= -802.3 kJ/mol-K

C₃H₈(g) + 5 O₂(g) → 3 CO₂(g) + 4 H₂O(g)

ΔH =ΔH⁰_f_products –ΔH⁰_f_reactants

ΔH = [(3xΔH⁰_f_CO2(g) )+ (4 x ΔH⁰_f_{H2O (g)} )]- [( ΔH⁰_f_C3H8(g) )+ (5 x ΔH⁰_f_{O2 (g)} )]

= [ (3x(−393.5)) +(4x( −241.8 ))]-[ −103.8 +(5x(0.0))]

= -2043.9 kJ/mol-K

Answer 2

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