College Chemistry - Thermodynamics

1

Calculate the change in free energy, in kilojoules, of the reaction at by using the free energies of formation.

$2N_2H_4(g)+2NO_2(g)\rightleftharpoons 3N_2(g)+4H_2O(g)$

$\Delta G^\degree _{f}$ values, in $\frac{kJ}{mol}$ , for molecules are as follows:

2

How do we know if a reaction is spontaneous?

3

Suppose that a given chemical reaction has an enthalpy change of $+175:\frac{kJ}{mol}$ and an entropy change of $+500:\frac{J}{mol\cdot K}$ . At what temperature would this chemical reaction be in equilibrium?

4

What is the standard change in free energy for a reaction run at $45^{o}C$ with an equilibrium constant of ?

5

Suppose that a given chemical reaction has an enthalpy change of $+175:\frac{kJ}{mol}$ and an entropy change of $+500:\frac{J}{mol\cdot K}$ . At what temperature would this chemical reaction be in equilibrium?

6

What is the standard change in free energy for a reaction run at $45^{o}C$ with an equilibrium constant of ?

7

Calculate the change in free energy, in kilojoules, of the reaction at by using the free energies of formation.

$2N_2H_4(g)+2NO_2(g)\rightleftharpoons 3N_2(g)+4H_2O(g)$

$\Delta G^\degree _{f}$ values, in $\frac{kJ}{mol}$ , for molecules are as follows:

8

How do we know if a reaction is spontaneous?

9

The second law of thermodynamics states which of the following is true regarding an isolated system?

10

How much heat is required to raise the temperature of of water from $1^{\circ}C$ to $99^{\circ}C$ ? Specific heat capacity of water is $4.18 J g^{-1}^{\circ}C^{-1}$

Thermodynamics

Practice Questions