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6-56) Use standard enthalpies of formation to calculate ΔHrxn° for each reaction. a) 2 H2S(g) +...

6-56) Use standard enthalpies of formation to calculate ΔHrxn° for each reaction.

a) 2 H2S(g) + 3 O2(g) ⇒2 H2O(l) + 2 SO2(g)

b) SO2(g) + 12 O2(g) ⇒ SO3(g)

c) C(s) + H2O(g) ⇒ CO(g) + H2(g)

d) N2O4(g) + 4 H2(g) ⇒ N2(g) + 4 H2O(g)

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Answer #1

a) 2 H2S(g) + 3 O2(g) ⇒2 H2O(l) + 2 SO2(g)

Hrex = Hf products - Hf reactants

             = 2*-296.82 + 2*-285.82 -(2*-20.16)   = -1124.96KJ

b) SO2(g) + 12 O2(g) ⇒ SO3(g)

Hrex = Hf products - Hf reactants

             = -395.72 -(-296.82 )   = -98.9KJ

c) C(s) + H2O(g) ⇒ CO(g) + H2(g)

Hrex = Hf products - Hf reactants

               = (-110.54 + 0) -(1.89-241.8)   = 129.37KJ

d) N2O4(g) + 4 H2(g) ⇒ N2(g) + 4 H2O(g)

Hrex = Hf products - Hf reactant

               = (4*-241.8 + 0)-(9.16+4*0)   = -976.36KJ

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