Given the following data, determine Delta Hrxn for the reaction: Br(g) + Cl(g) arrow BrCl(g)...


Given the following data, determine {eq}\Delta H_{rxn}^{\circ}{/eq} for the reaction:

{eq}Br(g) + Cl(g) \to BrCl(g){/eq}

  • {eq}\frac{1}{2}Br_2(l) \to Br(g); \Delta H^{\circ}{/eq} = 111.75 kJ
  • {eq}\frac{1}{2}Cl_2(g) \to Cl(g); \Delta H^{\circ}{/eq} = 121.38 kJ
  • {eq}\frac{1}{2}Br_2(l) + \frac{1}{2}Cl_2(g) \to BrCl(g); \Delta H^{\circ}{/eq} = 14.7 kJ

Hess' Law of Constant Heat Summation:

The enthalpy change of any unknown thermochemical reaction (reaction associated with some heat release or absorb) can be estimated by simple addition of enthalpy change of multiple reactions. This is defined in Hess' law of constant heat summation.

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We are given the following data:

  • The enthalpy change of reaction 1 is 111.75 kJ.
  • The enthalpy change of reaction 2 is 121.38 kJ.
  • The enthalpy...

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Using Hess's Law to Calculate the Change in Enthalpy of a Reaction


Chapter 13 / Lesson 3

Learn about enthalpy of reaction and enthalpy change formula. Understand what Delta H is, the Delta H equation, and how to calculate the enthalpy of reaction.

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