# Question 6.9: Calculating the Enthalpy of Reaction from Standard Enthalpie...

** Calculating the Enthalpy of Reaction from Standard Enthalpies of Formation**

Large quantities of ammonia are used to prepare nitric acid. The first step consists of the catalytic oxidation of ammonia to nitric oxide, NO.

4 \mathrm{NH}_{3}(g)+5 \mathrm{O}_{2}(g) \stackrel{\mathrm{Pt}}{\longrightarrow} 4 \mathrm{NO}(g)+6 \mathrm{H}_{2} \mathrm{O}(g)

What is the standard enthalpy change for this reaction? Use Table 6.2 for data.

**PROBLEM STRATEGY** You record the values of \Delta H_{f}^{\circ} under the formulas in the equation, multiplying them by the coefficients in the equation. You calculate \Delta H^{\circ} by subtracting values for the reactants from values for the products.

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