We just replaced the serpentine belt yesterday, after starting the car realized that the steering wasnt working, checked under the hood and the new serpentine belt is now broken, looks like it snapped

Maybe one of the drive pulleys has become seized. Sometimes the air conditioning compressor can be become seized and this puts a lot of strain on the serpentine belt. Did you take the tension of the tensioner pulley to slip the belt on or did you force it on. If you put it on with brute force the chances are that you did real damage to the belt. Check that all the pulleys turn (by hand). Check out how to take the tension off the tensioner pulley (often it is just a matter of putting a spanner on the pulley's central nut and rotating the mechanism anticlockwise against the spring tension. The belt should slip on without any effort if the tensioner is held back. Once on the tensioner can be released. The tension on the belt should be enough so that it is difficult to twist the belt, between pulleys, beyond about 90 degrees.