# Calculate Delta Hrxn for the reaction 5C + 6H2 arrow C5H12 using the following information. C5H12...

## Question:

Calculate {eq}\Delta H_{rxn} {/eq} for the reaction {eq}5C + 6H_2 \to C_5H_{12} {/eq} using the following information.

{eq}C_5H_{12} + 8O_2 \to 5CO_2 + 6H_2O; \Delta H {/eq} = -3505.8 kJ

{eq}C + O_2 \to CO_2; \Delta H {/eq} = -393.5 kJ

{eq}2H_2 + O_2 \to 2H_2O; \Delta H {/eq} = -483.5 kJ

## Hess's Law:

Hess's Law is useful as it is the way to measure non-measurable enthalpy changes in both physical and chemical changes. By using the enthalpy changes of its multiple reactions as per this rule, one can easily measure the enthalpy change of an overall reaction.

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The reaction for which the value of {eq}\Delta H {/eq} has to be calculated is shown below.

{eq}{\rm{5C}} + 6{{\rm{H}}_{\rm{2}}} \to...

Hess's Law: Definition, Formula & Examples

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Chapter 16 / Lesson 5
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Learn about Hess's law, statement, equations, and rules. See Hess's law diagram/cycle and the example of how to use Hess's law to find enthalpy changes.