(i) 1 mol of an ideal gas expands isothermally and reversible from `(P_(1)V_(1)T)` to `(P_(2)V_(2)T)`. Write down the equation showinig the amount of heat absorbed by the given ideal gas.
(ii) In an isothermal expansion of an ideal gas, the pressure of the gas decreases from `P_(1)` to `P_(2)`. write down the equation of work done by the gas in this process.
(iii) The temperature of 1 mol of an ideal gas is increased from `T_(1) and T_(2)`. write down the equations for the changes in enthalpy and internal energy.