Chemical Thermodynamics Quiz 5

A substance which shows highest entropy is

For a reaction, at 300K enthalpy is 138 kJ and entropy change is 115 $JK^{-1}$ . Hence the free energy change of the reaction is

Bond enthalpies of $H_2{^{-1}}$ , $I_{2(g)}$ and HI are 436, 151 and 298 kJ $mol^{-1}$ respectively. Hence enthalpy of formation of $HI_{(g)}$  is

The average bond energy of C-H bond is 410 $kJmol^{-1}$ . The enthalpy change of atomisation of $3.2 \ g$  $CH_{4(g)}$ is

For a certain reaction, $\Delta H$ = -50 kJ and $\Delta S$ = -80 $JK^{-1}$ , at what temperature does the reaction turn from spontaneous to non-spontaneous.

Third law of thermodynamics provides a method to evaluate which property?

One mole of which of the following has the highest entropy?

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is

In a reversible process the system absorbs 600 kJ heat and performs 250 kJ work on the surroundings. What is the increase in the internal energy of the system?

In a system where $\Delta E$ = -51.0 kJ, a piston expanded against a pext of 1.2 atm giving a change in volume of 32.0 L. What was the change in heat of this system?