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Calculate ΔH∘ in kilojoules for the reaction of acetylene (C2H2) (ΔH∘f=227.4kJ/mol) with O2 to yield carbon...

Calculate ΔH∘ in kilojoules for the reaction of acetylene (C2H2) (ΔH∘f=227.4kJ/mol) with O2 to yield carbon dioxide (CO2)(ΔH∘f=−393.5 kJ/mol) and H2O(g) (ΔH∘f=−241.8kJ/mol), a reaction which is supplied by the industrial gases industry for oxyacetylene gas welding and cutting due to the high temperature of the flame.

2C2H2(g)+5O2(g)→4CO2(g)+2H2O(g)

Express your answer using one decimal place.

Solutions

Expert Solution

fH0 C2H2 = 227.4 KJ/mol

fH0 O2(g) = 0 KJ/mol

fH0 CO2(g) = -393.5 KJ/mol

fH0 H2O(g) = -241.8 KJ/mol

H0 = fH0 (Product) - fH0 (Reactant)

H0 = [(4fH0 CO2) + (2fH0 H2O)] - [(2fH0 C2H2) + (5fH0 O2)]

= [(4 (-393.5)) + (2 (-241.8))] - [2(227.4) + (5 (0)]

= [-2057.6] - [454.8]

H0 = -2512.4 KJ/mol

H0 for reaction = -2512.4 KJ/mol

queen_honey_blossom answered 2 years ago
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