Q: Can I use a power cord from a Macbook air with a Macbook?

MBA power adapters are designed to provide less than the adapters for MBP.  You would pull too much from the adapter and damage it (most likely).

Try contacting apple on the chat now option

No, the MacBook Air power adapter is a 45 watt. A MacBook needs at least a 60 watt power adapter although you can use a MacBook Pro 85 watt adapter. You can use a higher wattage adapter without any problems.

http://support.apple.com/kb/HT2346