How much taxi fare from the hotel holiday inn Zhabei to Pudong airport at morning 05.00 am?

Oh, according to your time, you have to take a taxi to the airport. One regular taxi only can accpet four passengers. So you need two taxies. For one taxi, the fare is CNY 220 to 230 at that time.
Or you can ask help for TravelChinaGuide. They provide such mini van for you. And the price is also acceptable. You can book it in advance. If interested, their contact information is traveltravelchinaguide.com.