hess's law

Question

Which statement best describes Hess's Law?

RankGuru · Accepted Answer

1. **Hess's Law Statement**: The total enthalpy change for a chemical reaction is the same, regardless of whether the reaction occurs in one step or in several steps.
2. **State Function**: This is a direct consequence of enthalpy ($H$) being a **state function**. It depends only on the initial and final states of the system.
3. **Application**: It allows the calculation of $\Delta H$ for reactions that are difficult to measure directly by summing the $\Delta H$ values of other related reactions.
4. **Equation**: $\Delta H_{	ext{net}} = \sum \Delta H_{	ext{steps}}$.

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More hess's law Practice Questions

Given: C(s) + O₂(g) → CO₂(g), ΔH = −394 kJ; 2CO(g) + O₂(g) → 2CO₂(g), ΔH = −566 kJ. The enthalpy of ...