Use the Following Information to Determine the Standard Enthalpy of Formation

question 40

Multiple Choice

Use the following information to determine the standard enthalpy of formation of NH₃(g) .
N-H bond enthalpy = 390 kJ.mol^-1
$\Delta$ H_f ^$\omicron$ (H(g) ) = 217.9 kJ.mol^-1
$\Delta$ H_f ^$\omicron$ (N(g) ) = 472.6 kJ.mol^-1

• A) -44 kJ.mol^-1
• B) -691 kJ.mol^-1
• C) -516 kJ.mol^-1
• D) -83 kJ.mol^-1
• E) -1170 kJ.mol^-1

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