7. In an experimental set-up, 4.470 kg of salt solution is heated in a glass vessel by a bumer. An electric stirrer is used to ensure uniform heating of the solution. The internal energy of the solution is to be increased from 200 to 250 kJ/kg in 17.14 minutes. The power consumption of the stirrer is 30.44 W. Determine the power of the gas burner required in W. I