Thermodynamics ...

500 J of heat was supplied to a system at constant volume.It resulted in the increase of temperature of the system from $$20^oC$$ to $$25^oC$$ .What is the change in internal energy of the system?

The P - V diagram of a system undergoing a thermodynamic process is shown in figure. Work done by the system in going from $$A \rightarrow B \rightarrow C$$ is 30 J and 40 J heat is given to the system. The change in internal energy of the gas if the gas is directly taken from A to C  is 

The internal energy of a gas in an adiabatic process is given by $$U=a+bPV$$  find y:-

For reaction $$ A \rightarrow B $$, $$ \Delta H $$ and $$ \Delta S $$ are positive. the most favourable condition of spontaneous process.

The standard reduction potentials for $$ Zn^{2+} /Zn, Ni^{2+} / Ni $$ and $$ Fe^{2+}  $$ are -0.76, -0.23 and -0.44V respectively. The reduction $$ X +Y^{2+} \rightarrow X^{2+} +Y $$ will be spontaneous when :

In which of the following ionic compounds, $$\Delta H_f$$ is negative only due to lattice energy: 
(i) $$NaF$$       (ii) $$MgO$$        (iii)$$Li_2N$$      (iv)$$Na_2S$$

When a bottle of perfume is opened, odorous molecules mix with air and slowly diffuse throughout the entire room. The incorrect fact about the process is:

At $$57^o$$C, gaseous dinitrogen tetraoxide is $$50\%$$ dissociated. Calculate the standard free energy change per mole of $$N_2O_4(g)$$ at this temperature and at $$1$$ atm.
$$R=8.3 JK^{-1}mol^{-1}$$, ln$$10=2.3$$, log $$2=0.3$$, log $$3=0.48$$.

$$ \triangle G$$ of the conversion of 2 mol of $$ C_6H_6(I)  at 80^oC $$ (normal boiling point) to vapour at the same temperature and a pressure of 0.2 atm is: