Here are some commonly needed volume to weight conversions from a popular reference:

All-purpose flour: 1 cup = 5 oz = 142 g

Bread flour: 1 cup = 5.5 oz = 156 g

Whole wheat flour: 1 cup = 5 oz = 144 g

Rye flour: 1 cup = 4.6 oz = 130 g

For reference

1 cup = 2.37 dl
1 dl = 0.423 cup = 6.8 tbs

(cup and tbs are US (presumably ANSI) cup and US tablespoon. I have no idea what a metric cup or metric tablespoon are, although they do seem to exist!).

sPh