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## Homework Statement

The specific rotation of a tetrasaccharide was measured to be -20.5°. Upon complete hydrolysis in acid the optical rotation of the solution was found to be -36.9°. Knowing that the specific rotations of n-acetylgalacosamine,3-deoxy-l-fucose and 2-deoxy-D-ribose are -105°,-75.7° and 18.7°. What is the specific rotation of 4-methoxy-d-mannose?

b]2. Homework Equations [/b]

## The Attempt at a Solution

1/4(-105)+1/4(-75.5)+1/4(18.7)+1/4x=-36.9

and solve for x=14.2 for 4-methoxy-d-mannose

Can anyone tell me If Im doing this correctly? It seems too simple...