Question

Based on the equation and the information in the table, what is the enthalpy of the reaction?

Answer 1

The enthalpy of the reaction is 226.73 kJ when 1 mol of C2H2 is formed.

What is enthalpy?

Enthalpy is the sum of the internal energy. and pressure times volume.

$2 C (s, graphite) + H_2 (g)$  → $C_2H_2 (g)$

The enthalpy of formation (ΔHf) of $C_2H_2$ (g) is 226.73 kJ/mol.

The enthalpy of formation of C (s, graphite) is zero because Carbon is in its elemental state.

The enthalpy of formation of $H_2$ (g) is zero because is taken as a reference.

ΔHrx = ∑ΔHf of products - ∑ΔHf of reactants

ΔHrx = 226.73 kJ/mol X 1 mol - 0

= 226.73 kJ

Hence, the enthalpy of the reaction is 226.73 kJ when 1 mol of $C_2H_2$ is formed.

Learn more about the enthalpy here:

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