A parallel-plate air-filled capacitor with area 60 cm2 and plate spacing 1.0 mm is charged to the potential difference of 650 V. Determine (i) the capacitance in pico-farads (ii) the magnitude of the charge in nano-coulombs on each plate (iii) the stored energy in micro-joules, (iv) the electric field in N/C among the plates (v) the energy density among the plates.