That is approximately 5.5 ounces flour
8 quarter cups
There are approximately 3 cups of flour in 14 ounces.
that is 3.5 cups of flour
102.25 cups
2 and a quarter cups equate to 9oz of flour.
That is about 1.1 cups
That is approximately 5.681 cups of plain white flour.
Here is a wonderful conversion tool for flour http://www.traditionaloven.com/conversions_of_measures/flour_volume_weight.html
1 cup = 8oz so....2 cups + 1.5oz
420 grams of flour is equivalent to about 3 and a quarter cups of flour.
That would be 6 ounces
17.5 ounces will be equal to 24.81 cups of flour.