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In a reaction, the change in entropy is given as 2.4 cal/K and the change in Gibbs free energy is given as 3.4 kcal, calculate the change in heat at the temperature of 20-degree centigrade?(a) 3.4 kcal(b) 3.4 cal(c) 3.4 kJ(d) 3.4 JI got this question by my college professor while I was bunking the class.My question is taken from Gibbs Energy Change and Equilibrium topic in chapter Thermodynamics of Chemistry – Class 11

Answer»

Correct OPTION is (a) 3.4 kcal

Explanation: Using the EQUATION ΔG = ΔH – TΔS, where G is represented by the Gibbs free energy, H is represented by the CHANGE in enthalpy, T is represented by the temperature and S is represented by the entropy. ΔH = ΔG + TΔS = 3.4 kcal – 293 x 2.4 cal/K = 3.4 kcal.



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