What is the change in enthalpy of the first reaction below,

Last updated: 7/26/2022

What is the change in enthalpy of the first reaction below, given the enthalpies of the other two reactions? 2NO₂(g) →2NO(g) + O₂(g) N₂(g)+0₂(g) → NO(g) N₂(g) +O₂(g) → NO₂(g) ΔH°-90 kJ/mol ΔH-34 kJ/mol A. -112 kJ B. 112 kJ C. 248 kJ D. -56 kJ