From the data given, determine which of the four cases for the sign on Delta G a

Question

From the data given, determine which of the four cases for the sign on Delta G applies (1: always spontaneous; 2:nonspontaneous at low temperature, but spontaneous at high temperature; 3: spontaneous low, non spontaneous high; 4: never spontaneous.) H_2(g) rightarrow 2H(g) Delta H =+435.88 kJ/mol____________ 2SO_2(g) + O_2(g) rightarrow 2SO_3(g) Delta H =-197.8kJ/mol___________ N_2H_4(g) rightarrow N_2(g) + 2H_2(g) Delta H= -95.4 kJ/mol___________ N_2(g) + 3Cl_2(g) rightarrow 2NCl_3(1) Delta H = +230 kJ/mol____________

Explanation / Answer

G = H - TS

then, for exothermic, and high entropy reactions --> always spontanous

then, for endothermic, and high entropy reactions --> High T , spontanous

then, for endothermic, and low entropy reactions --> NEVER spontanous

finally, for exothermic, low entropy reactions --> low T, spontanous

then

reaction 1 --> endothermic, high entropy --> High T , spontanous

reaction 2 --> exothermic, low entropy --> low T, will be spontnaous

reaction 3 --> exothermic, high entropy --> always spontanous

reaction 4 --> endothermic, low entropy --> never spontanous

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