List of top Chemistry Questions on internal energy asked in BITSAT

The enthalpy of sublimation of aluminium is \(330\,\text{kJ mol}^{-1}\). Its I\(^\text{st}\), II\(^\text{nd}\) and III\(^\text{rd}\) ionization enthalpies are 580, 1820 and \(2740\,\text{kJ mol}^{-1}\) respectively. How much heat must be supplied in kJ to convert 13.5 g of aluminium into Al\(^{3+}\) ions and electrons at 298 K?
In a thermodynamic process, the pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20 J of heat and 8 J of work is done on the gas. If the initial internal energy of the gas is 30 J, the final internal energy will be:
In which of the following reactions, standard entropy change (\( \Delta S^\circ \)) is positive and standard Gibbs’s energy change (\( \Delta G^\circ \)) decreases sharply with increasing temperature?