(Solved): (b) The PV diagram in the Figure below shows a cycle of heat engine that uses \( 2.50 \) mole of a ...

(b) The PV diagram in the Figure below shows a cycle of heat engine that uses \( 2.50 \) mole of a monatomic ideal gas. Process ca is isothermal. Calculate: (i) the pressure of the gas at point a; (ii) the temperature of the gas at points a, b, and \( \mathrm{c} \); (iii) the heat exchange in the processes \( \mathrm{ab} \) and \( \mathrm{bc} \) and indicate the heat is absorbed or liberated; (iv) the change of internal energy of the gas in processes ab, bc and ca.