A carbohydrate is mass, and "gram" is a unit to measure the weight of mass. So any given mass of carbohydrate will have a weight measurable in grams. For instance, 1 cup of corn weighs 166 grams. Of...
The standard measure is 60 ml for a large peg and 30 ml for small. One bottle of whiskey is generally of 750 ml and that makes it to 25 small pegs or 12 large and 1 small in a bottle.