Which adapter do I buy?

I need to buy a new adapter for my MacBook Air 13,3". Information about my laptop: has serial number C0******JWT (mid 2011), processor 1,7 GHz Intel Core i5. I need to buy a new MagSafe Power adapter. The one I used until now was 45w. Please help me.
/Anna
<Edited by Host>

This should assist you:
http://support.apple.com/kb/ht2346
http://store.apple.com/us/product/MC747LL/A/apple-45w-magsafe-power-adapter-for- macbook-air
The 45w charger is the appropriate one for a MBA.
Ciao.

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