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Consider the following reaction:

Consider the following reaction:

Consider the following reaction:

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Expert Answer
Expert Answer

Solved Chegg Answers

1)
The reaction you have is: 2 NO + O2 -> 2 NO2
It means that 2 NO and O2 must be on the left side and 2 NO2, on the right one, so you will look for the entalphies that were given and invert and/or multiply to copy this order, look:

1/2 N2(g) + O2(g) –> NO2(g), deltaH = 33.2 kJ (should be multiplied by 2)

N2 + 2 O2 -> 2 NO2………deltaH = +66,4 kJ

1/2 N2(g) + 1/2O2(g) –> NO(g), delta H = 90.2 kJ (should be multiplied by 2 and inverted)

2 NO -> N2 + O2…………..deltaH = -180,4 kJ

Now you have:
N2 + 2 O2 -> 2 NO2………deltaH = +66,4 kJ
2 NO -> N2 + O2…………..deltaH = -180,4 kJ
————————————–…
canceling both N2 and 2 O2 with O2, you will find the given reaction:
2 NO + O2 -> 2 NO2……..deltaH = 66,4 – 180,4 = -114,0 kJ

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