1 what is the sign of ?? if a reaction requires heat (endothermic) a. positive b

Question

1 what is the sign of ?? if a reaction requires heat (endothermic) a. positive b. negative c. none What is the sign of TAS if the reaction becomes more disordered? d. positive e. negative f. none 2. Can a reaction require heat (endothermic) and yet be favorable (exergonic)? 3. If ?G--40kcal/mol and ?? is 20kcal/mol what is ??S? 4. The formation of van der Waals bonds is favorable in water (AG 0 6 A situation where heat is given off by a reaction is the definition of a. positive entropy b. negative entropy c. postitive enthalpy d. negative enthalpy 7, what are the dimensions of ?. ?11 and TAS?

Explanation / Answer

1. For endothermic reactions ?H is positive.

Entropy is the measure of degree of disorderness. If reaction becomes more disordered ?S becomes positive. So T?S value becomes positive.

2. For exergonic reactions, require some amount of heat energy is required.

3. ?G=?H-T?S.

==>T?S=?H-?G = 20+40 =60 kcal/mol

4. ?G <0 means -ve. And ?H =0. Then T?S is +ve.

5. More disordered means +ve entropy.

6. When heat is given off by reaction, it is exothermic and hence -ve enthalpy.

7. Dimensions of ?G, ?H, T?S is 'kcal/mol'.

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