# Chemistry

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Calculate the enthalpy change for the reactions
NO(g) + O(g) → NO2(g)
from the following data:
NO(g) + O3(g) → NO2(g) + O2(g) ΔH = -198.9 kJ
O3(g) → 1.5O2(g) ΔH = -142.3 kJ
O2(g) → 2O(g) ΔH = 495.0 kJ

• Chemistry -

Take equation 1 and add it to the reverse of equation 2 and add that to the reverse of 1/2 equation 3.
When reversing dH, change the sign.
When taking 1/2 equation, also take 1/2 dH.

• Chemistry -

530kj

• Chemistry -

-304.1kJ

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