4. All of the equations below are r eactions that have AHm associated with them.

Question

4. All of the equations below are r eactions that have AHm associated with them. Which, if any. also could be used to describe heats of formation? If they don't describe heats of formation, how could you change them so they would describe heats of formation? b, as, graphite) + 2H2(g) CHalg) d. NO(g) + ½2(g) NO2(g) Which of the following is the best equation for the formation of CHyNO2W) from its elements in standard state? 5. C(s) + H2 (g) + N2(g) + 02(g) CH3N02(1) C(s) + 3H2(g) + N2(g) + 202(g) CH3N02(1) a. b, d. 2C(s) +3H2(g)+ N2(g) +202(g) 2CH3NO2) Example on the board: Find Hon for the following reactions using the given any for each compound 6, AK 02 (s) + 2 CONg) 2KC03 (s) + 302 (g) AH; ( ) -284.9-393.5-1151.0 Find &Horn; for the following reactions using the given + for each compound 2Fe(s) Fe2O3(s) 824.2 kl/mol 1675.7 k/mol 7, A1203(s) + 2Al(s)

Explanation / Answer

4.

Of all the reactions, the one that descirbe heat of formation would be,

( option b.)

5.

Eqaution for formation of CH3NO2

(option c.)

6.

dHo(rxn) = dHo(products) - dHo(reactants)

                   = (-1151) - (4 x -284.9 + 2 x -393.5)

                   = 775.6 kJ/mol

7.

dHo(rxn) = dHo(products) - dHo(reactants)

                   = (-1675.7) - (-824.2)

                   = -851.5 kJ/mol

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