Well a cup and an ounce measure different sorts of things and dry spaghetti is going to be different from cooked but if you are figuing a cup as a serving then 2 ounces (by weight not with a measuring cup) is a serving of pasta. If you dont have a scale just estimate that it will double in size when you cook it.
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You would have to specify WHICH pasta as all pasta ranges in weight from 65 to almost 230 grams per cup.