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...
Globally speaking, it's rice. It's the staple food in most of Asia... But if you talk of biochem, it's glucose... Actually, Sucrose is the most abundant