Hess's law states that "the heat released or absorbed in a chemical process is the same whether the process takes place in one

Question

Hess's law states that "the heat released or absorbed in a
chemical process is the same whether the process takes
place in one or in several steps." It is important to recall the
following rules:
1. When two reactions are added, their enthalpy
values are added.
2. When a reaction is reversed, the sign of its
enthalpy value changes.
3. When the coefficients of a reaction are
multiplied by a factor, the enthalpy value is
multiplied by that same factor.
V
Part A
Calculate the enthalpy of the reaction
given the following reactions and enthalpies of formation:
1. N₂(g) + O2(g)-NO2(g), AH = 33.2 kJ
2.
N2(g) + O2(g) →NO(g), AH = 90.2 kJ
Express your answer with the appropriate units.
2NO(g) + O₂(g) →2NO₂(g)
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