Question

Will the reaction 2 NO2 -> N2O4 occur at 25C?Delta H = - 57.2KJDelta S= - 0.176 KJ/K

Answer 1

Step 1

At constant temperature and pressure, the change in Gibbs free energy is defined as ΔG = ΔH − T ΔS

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Step 2

When ΔG < 0 (negative) the reaction will proceed spontaneously

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Step 3

Information provided:

Delta H = ΔH = - 57.2KJ

Delta S = ΔS = - 0.176 KJ/K

T = 25 °C + 273 = 298 K

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Step 4

Procedue:

ΔG = ΔH − T ΔS = -57.2 kJ - (-0.176 kJ/K) x 298 K = - 4.752 kJ

Therefore, the reaction will occur spontaneously.

Answer: Yes, it wil (because of the procedure)