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The Ostwald process for the commercial production of nitric acid from ammonia and oxygen involves the following steps:
4NH3 (g) + 5O2 (g) → 4NO (g) + 6 H2O (g)
2NO(g) + O2 (g) → 2NO2 (g)
3NO2 (g) + H2O (l) → 2HNO3 (aq) + NO (g)
a. Use the values of ΔH°f in Appendix 4 to calculate the value of ΔH° for each of the preceding reactions.
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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl 2nd Edition practice problems.