Which of these compounds are stable and won't decompose into their elements at 25◦C?
Which of the following is/are stable and won't decompose into their elements at standard conditions at 25 degrees C? (298 degrees kelvin)
CuO(s) ∆H= −157.3 S= 42.63 ∆G= −129.7
N2H4(l) ∆H= 50.63 S= 121.21 ∆G= 149.34
C6H12(l) ∆H= −156.4 S= 26.7 ∆G= 204.4
PCl3(g) ∆H= −287.0 S= 311.78 ∆G= −267.8
additional info: H and G are in kj/mol
S is in J/mol
H = enthalpy
S = Entropy
G = Gibbs Free Energy
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Verified answer
Spontaneous reaction occur if Gibbs free energy is negative, ΔG < 0. Then, system with ΔG V 0 won't decompose, because it form the products.
CuO(s) ∆H= −157.3 S= 42.63 ∆G= −129.7
PCl3(g) ∆H= −287.0 S= 311.78 ∆G= −267.8