1)Given the following data: 2H2(g) + O2(g) → 2H2O(l) ΔH = -571.6 kJ CO2(g) + 2H2O(l)...

1)Given the following data: 2H2(g) + O2(g) → 2H2O(l) ΔH = -571.6 kJ CO2(g) + 2H2O(l) → CH4(g) + 2O2(g) ΔH = +890.3 kJ C(s) + O2(g) → CO2(g) ΔH = -393.5 kJ Find the ΔH of the following reaction: C(s) + 2H2(g) → CH4(g)

Expert Solution

2H₂(g) + O₂(g) 2H₂O(l) H₁= -571.6KJ 1^st equation

CO2(g) + 2H2O(l) → CH4(g) + 2O2(g) ΔH₂ = +890.3 kJ 2^nd equation

C(s) + O2(g) → CO2(g) ΔH₃ = -393.5 kJ 3^rd equation

we required

C(s) + 2H2(g) → CH4(g) H=?

if we add 1^st + 2^nd + 3^rd equation

2H₂(g) + O₂(g) 2H₂O(l) H₁= -571.6KJ

CO2(g) + 2H2O(l) → CH4(g) + 2O2(g) ΔH₂ = +890.3 kJ

C(s) + O2(g) → CO2(g) ΔH₃ = -393.5 kJ

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then we easly get required equation

C(s) + 2H2(g) → CH4(g) H=H₁+H₂+H₃

H=-571.6KJ +890.3 kJ -393.5 kJ = -74.8KJ

queen_honey_blossom answered 2 years ago

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