Given that for the reaction. N2(g) + 3H2(g) ⇌ 2NH3(g) ∆H = 92KJ. What is the enthalpy of formation of ammonia from its elements?

A. -46KJ mol -1
B. -184KJmol -1
C. 184KJmol -1
D. 184KJmol -1
E. +46KJmol -1

Correct Answer: Option A

A. -46KJ mol -1