Question

The enthalpy change for the reaction C2H2 + 5/2 O2→ 2CO2 + H2O is known as enthalpy of: *​

Answer 1

Explanation:

Given the following data: C2H2(g) + 5/2O2(g) → 2CO2(g) + H2O(l) ΔH = -1300. kJ...

Question:

Given the following data:

C2H2(g) + 5/2O2(g) → 2CO2(g) + H2O(l) ΔH = -1300. kJ

C(s) + O2(g) → CO2(g) ΔH = -394 kJ

H2(g) + 1/2 O2(g) → H2O(l) ΔH = -286 kJ

Calculate ΔH for the reaction 2C(s) + H2(g) → C2H2(g)

Hess's Law:

The enthalpy change of a reaction defines the amount of heat absorbed or evolved by the reaction under constant pressure. This thermodynamic quantity is a state function. This means that its value is not affected by the route taken in order to form the products of the reaction. Thus, in the diagram below, the enthalpy change of reaction 1 is equal to the sum of the enthalpy changes of reactions 2 and 3.

Answer and Explanation: 1

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We have the following desired reaction below whose enthalpy change,

Δ

H

, is unknown:

{eq}\rm 2C(s) + H_2(g) → ...

Answer 2

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