4. All of the equations below are reactions that have AHram associated with them

Question

4. All of the equations below are reactions that have AHram 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. Cls,graphite) + alg) CHIg) d. NO(g) + ½ O2(g) NOlg) following is the best equation for the formation of CHyNO2 () from its elements in C (s) + H2(g) + N2(g) + 02(g) C,NO,() C(s) +3H2(g) + N2(g) + 202(g)- CH,NO2() 5. Wh standard state? a. b. d. 2C(s) + 3H2(g) + N2(g) + 202(g) 2CH,N02() Example on the board: Find 1mn for th compound 6, e following reactions using the given He for each AK02 (s) + 2 CO2(g) 2 K2C03 (s) + 3 02 (g) dH; (%) 284.9393.5 -1151.0 -284.9-393.5-1151.0 for each compound Find Hon for the following reactions using the given + 7. 2Fe(s) Fe203(s) -824.2 kJ/mol A403(s) + -1675.7 kJ/mol 2Al(s)

Explanation / Answer

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

b.

5. Eqaution for formation of CH3NO2

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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