Enthalpy changes for the following reactions can be determined experimentally: C2H4(g) + 3 O2(g) → 2...

Question

Question

Enthalpy changes for the following reactions can be determined experimentally:

C₂H₄(g) + 3 O₂(g) → 2 CO₂(g) + 2 H₂O(l)

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

ΔH^o_rxn = -1411.1 kJ/mol-rxn

ΔH^o_rxn = -1367.5 kJ/mol-rxn

Use the given values to determine the enthalpy change for the reaction:

C₂H₄(g) + H₂O(l) → C₂H₅OH(l)

ΔH^o_{rxn (answer)} = kJ/mol-rxn

science chemistry

Answer 1

Answer #1

Lets number the reaction as 1, 2, 3 from top to bottom

required reaction should be written in terms of other reaction

This is Hess Law

required reaction can be written as:

reaction 3 = +1 * (reaction 1) -1 * (reaction 2)

So, ΔHo rxn for required reaction will be:

ΔHo rxn = +1 * ΔHo rxn(reaction 1) -1 * ΔHo rxn(reaction 2)

= +1 * (-1411.1) -1 * (-1367.5)

= -43.6 KJ

Answer: -43.6 KJ

Answer 2

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