Help with Hess's Law and thermodynamic values.?

Question

Apply Hess’s Law, use the data of the given reaction and data from the data table to calculate the enthalpy change for the formation of nitrogen monoxide from its elements.

(Hint: Which reaction is described with the data: ΔH f H2O(g) = −241.8 kJ / mol )

Pas die Wet van Hess toe, gebruik die data van die gegewe reaksie en data uit die datatabel en bereken die entalpie verandering vir die vorming van stikstofmonoksied vanuit sy elemente.

(Wenk: Watter reaksie word beskryf met die data: ΔH f H2O(g) = −241.8 kJ / mol )

4 NH3 (g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) ΔH rxn = −906.2 kJ

The link to the table is http://boomeria.org/chemtextbook/tableA-6.jpg

ChemTeam · Accepted Answer

Boomeria? Good ole P Q LeBoom up in Santa Cruz. Check out his "Advice for Rookie Teachers." Awesome!

The reaction described with ΔH f H2O(g) = −241.8 kJ / mol is this:

H2(g) + (1/2)O2(g) ---> H2O(g)

It's the formation reaction for water as a gas (NOT as a liquid, which is the standard state for water).

To solve the last problem, here are some examples of what to do:

http://www.chemteam.info/Thermochem/HessLawIntro2.html

ryann · Answer

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Help with Hess's Law and thermodynamic values.?

2 Answers