Splitting one mole of a gas X₂ into two moles of X takes in 63.5 kJ. Four moles of X now pair up into X₂. What is Δ H for this change?

ChemistryMediumHigh School (11–12)Chemical Thermodynamics › Enthalpy and Hess's Law

Splitting one mole of a gas $\text{X}_2$ into two moles of $\text{X}$ takes in $63.5\ \text{kJ}$ . Four moles of $\text{X}$ now pair up into $\text{X}_2$ . What is $\Delta H$ for this change?

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← Given Δf Hᵒᵐⁱⁿᵘˢ of C₂H₄(g) = +52.3 kJ/mol and of C₂H₆(g) = -84.7 kJ/mol, find Δr Hᵒᵐⁱⁿᵘˢ for C₂H₄(g) + H₂(g) → C₂H₆(g).Which kind of standard enthalpy change is always negative? →

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