Write a thermochemical equation to represent the standard enthaply of formation

Question

Write a thermochemical equation to represent the standard enthaply of formation (Delta H_f degree) for the formation of NO(g) from its elements under standard conditions; this reaction absorbs 90.29 kJ of energy per mole of NO formed. Identify which of the reactions below has a value of delta H degree that corresponds to the enthalpy of formation, delta H f degree? (State "yes" if it does correspond to delta H_f degree and "no" if it docs not.) a. NO(l) + 1/2 O_2(g) rightarrow NO_2(g) b. 1/2 N_2(g) + 3/2 H_2(g) rightarrow NH_3(g) c. 2H(g) + O(g) rightarrow H_2O(l) d. Fe(s) + 3/2 O_2(g) rightarrow Fe_2O_3(s) e. 6C(g) + 3H_2(g) rightarrow C_6H_6(l)

Explanation / Answer

Standard enthalpy of formation is the amount of heat liberated/absorbed when 1 mole of substancein its standard state is formed from the elements in their standard states.

2) 1/2 N2(g) + 1/2O2(g) -------> NO(g) : enthalpy of formation =+90.29kJ/mol

3) a)NO

b)Yes

c)No

d)yes

e) No ( Carbon is not in its standard state of graphite)

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