For a certain reaction DGq 45 kJ mol and DHq 90 kJ mol at 0 deg C What is the minimum temperature at...........

General Science (CDS) Physics

For a certain reaction, DGq = -45 kJ/mol and DHq = -90 kJ/mol at 0°C. What is the minimum temperature at which the reaction will become spontaneous, if DHq and DSq are independent of temperature?

273 K

298 K

546 K

596 K

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Explanation:

DGq = -45 KJ/mol DHq = -90 KJ/mol T = 273 °K Using the formula, DGq = DHq – TDS -45 = -90 – 273 DS DS = 0.164 Now since DHq and DSq are independent, T2 = DH/DS = 45/0.164 = 273°K Required Temp = 273 + 273 = 546°K