A stationary insulated rigid tank contains 1 kg of an ideal gas with constant specific heats (Cv = 0.7 kJ/kgK and Cp = 1.0 kJ/kgK) at 27°C and 300 kPa. A paddle wheel with a power capacity of 20 W is operated inside the tank for 15 minutes. The final pressure of air (in kPa) in the tank will be
1
100.7
2
225.7
3
318.7
4
325.7